John Elmerdahl Olsen

John Elmerdahl Olsen

Professor

Member of:

    ORCID: 0000-0001-6225-6587

    Publication year:
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    1 - 488 out of 488Page size: 500
    1. 2024
    2. Published

      Salmonella Gallinarum mgtC mutant shows a delayed fowl typhoid progression in chicken

      Rodrigues Alves, L. B., Freitas Neto, O. C. D., Saraiva, M. D. M. S., do Monte, D. F. M., de Lima, B. N., Cabrera, J. M., Barbosa, F. D. O., Benevides, V. P., de Lima, T. S., Campos, I. C., Rubio, M. D. S., Nascimento, C. D. F., Arantes, L. C. R. V., Alves, V. V., de Almeida, A. M., Olsen, John Elmerdahl & Berchieri Junior, A., 20 Jan 2024, In: Gene. 892, 147827.

      Research output: Contribution to journal › Journal article › Research › peer-review

    3. Published

      Diet composition drives tissue-specific intensity of murine enteric infections

      Israelson, H., Vedsted-Jakobsen, Amalie, Zhu, L., Gagnaire, A., von Münchow, Alexandra, Polakovicova, N., Valente, Angela Hørdum, Raza, Ali, Andersen-Civil, A. I. S., Olsen, John Elmerdahl, Myhill, Laura Jessica, Geldhof, P. & Williams, Andrew Richard, 2024, In: mBio. 15, 2, 22 p., e0260323.

      Research output: Contribution to journal › Journal article › Research › peer-review

    4. Published

      Genome-wide identification of fitness-genes in aminoglycoside-resistant Escherichia coli during antibiotic stress

      Wellner, Sandra Marina, Alobaidallah, M. S. A., Fei, Xiao, Herrero-Fresno, A. & Olsen, John Elmerdahl, 2024, In: Scientific Reports. 14, 16 p., 4163.

      Research output: Contribution to journal › Journal article › Research › peer-review

    5. Published

      Genomic Features and Phylogenetic Analysis of Antimicrobial-Resistant Salmonella Mbandaka ST413 Strains

      Benevides, V. P., Saraiva, M. M. S., Nascimento, C. F., Delgado-Suárez, E. J., Oliveira, C. J. B., Silva, S. R., Miranda, V. F. O., Christensen, Henrik, Olsen, John Elmerdahl & Berchieri Junior, A., 2024, In: Microorganisms. 12, 2, 16 p., 312.

      Research output: Contribution to journal › Journal article › Research › peer-review

    6. Published

      Lack of correlation between growth, stress, and virulence phenotypes in strains of Salmonella enterica serovar Enteritidis, S. Typhimurium DT104, S. 4,12, b:- and S. Liverpool

      Olsen, John Elmerdahl, Frees, Dorte, Kyvsgaard, N. C. & Barco, L., 2024, In: Letters in Applied Microbiology. 77, 2, 9 p., ovae015.

      Research output: Contribution to journal › Journal article › Research › peer-review

    7. 2023
    8. Published

      SKIN ULCERATIONS IN DANISH NURSERY PIGS

      Barington, Kristiane, Pankoke, K., Hartmann, Katrine Top, Hansen, Mette Sif, Jensen, Henrik Elvang, Blirup-Plum, Sophie Amalie, Jørgensen, B. M., Nielsen, Jens Peter, Eriksen, E. Ø., Kudirkiene, E., Olsen, John Elmerdahl & Pedersen, Ken Steen, 30 Aug 2023.

      Research output: Contribution to conference › Conference abstract for conference › Communication

    9. Published

      A Virus-like Particle-Based F4 Enterotoxigenic Escherichia coli Vaccine Is Inhibited by Maternally Derived Antibodies in Piglets but Generates Robust Responses in Sows

      Aves, Kara-Lee, Guerra, Priscila Regina, Fresno, A. H., Saraiva, M. M. S., Cox, E., Bækbo, P. J., Nielsen, Morten Agertoug, Sander, Adam F. & Olsen, John Elmerdahl, 2023, In: Pathogens. 12, 12, 19 p., 1388.

      Research output: Contribution to journal › Journal article › Research › peer-review

    10. Published

      An observational field study of porcine post-weaning diarrhea: clinical and microbiological findings, and fecal pH-measurements as a potential diagnostic tool

      Eriksen, E. Ø., Kudirkiene, E., Barington, Kristiane, Goecke, Nicole Bakkegård, Blirup-Plum, Sophie Amalie, Nielsen, Jens Peter, Olsen, John Elmerdahl, Jensen, Henrik Elvang, Pankoke, K., Larsen, Lars, Liu, G. & Pedersen, Ken Steen, 2023, In: Porcine Health Management. 9, 33.

      Research output: Contribution to journal › Journal article › Research › peer-review

    11. Published

      Assessing phenotypic virulence of Salmonella enterica across serovars and sources

      Petrin, S., Wijnands, L., Benincà, E., Mughini-Gras, L., Delfgou-van Asch, E. H. M., Villa, L., Orsini, M., Losasso, C., Olsen, John Elmerdahl & Barco, L., 2023, In: Frontiers in Microbiology. 14, 1184387.

      Research output: Contribution to journal › Journal article › Research › peer-review

    12. Published

      Bacteriostatic and Haemolytic Activities of Extracts and Compounds of Commiphora swynnertonii

      Msengwa, Z., Credo, D., Mafuru, M., Mwesongo, J., Mabiki, F. P., Mwang’onde, B. J., Mtambo, M. M., Kusiluka, L. J., Mdegela, R. H. & Olsen, John Elmerdahl, 2023, In: Research Journal of Pharmacognosy. 10, 2, p. 47-56 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    13. Published

      Effect of feeding dairy calves with milk fermented with selected probiotic strains on occurrence of diarrhoea, carriage of pathogenic and zoonotic microorganisms and growth performance

      Fresno, A. H., Farias Alencar, Anna Luiza, Liu, G., Wridt, M. W., Andersen, F. B., Pedersen, H. S., Martin, H. L., Nielsen, Søren Saxmose, Aabo, S., Olsen, John Elmerdahl & Jensen, A. N., 2023, In: Veterinary Microbiology. 286, 109885.

      Research output: Contribution to journal › Journal article › Research › peer-review

    14. Published

      Epifriedelanol is the key compound to antibacterial effects of extracts of Synadenium glaucescens (Pax) against medically important bacteria

      Msengwa, S. Z., Rwegoshora, F., David, C., Mwesongo, J., Mafuru, M., Mabiki, F. P., Mwang’onde, B. J., Mtambo, M. M., Kusiluka, L. J. M., Mdegela, R. H. & Olsen, John Elmerdahl, 2023, In: Frontiers in Tropical Diseases. 3, 1104543.

      Research output: Contribution to journal › Journal article › Research › peer-review

    15. Published

      Estimating potential farm economic benefits of advanced microbiological diagnostics in veterinary medicine

      Jensen, Jørgen Dejgård, Christensen, Tove, Pansri, P. & Olsen, John Elmerdahl, 2023, In: Animal Production Science. 63, 15, p. 1545-1558

      Research output: Contribution to journal › Journal article › Research › peer-review

    16. Published

      Gastro-intestinal lesions are not relatable to diarrhoea or specific pathogens in post-weaning diarrhoea (PWD) in pigs

      Blirup-Plum, Sophie Amalie, Jensen, Henrik Elvang, Nielsen, Søren Saxmose, Pankoke, K., Hansen, Mette Sif, Pedersen, Ken Steen, Eriksen, E. Ø., Nielsen, Jens Peter, Olsen, John Elmerdahl, Kudirkiene, E., Larsen, Lars, Goecke, Nicole Bakkegård & Barington, Kristiane, 2023, In: Acta Veterinaria Scandinavica. 65, p. 1-18 18 p., 30.

      Research output: Contribution to journal › Journal article › Research › peer-review

    17. Published

      Genomics, biofilm formation and infection of bladder epithelial cells in potentially uropathogenic Escherichia coli (UPEC) from animal sources and human urinary tract infections (UTIs) further support food-borne transmission

      García, V., Lestón, L., Parga, A., García-Meniño, I., Fernández, J., Otero, A., Olsen, John Elmerdahl, Herrero-Fresno, A. & Mora, A., 2023, In: One Health. 16, 100558.

      Research output: Contribution to journal › Journal article › Research › peer-review

    18. Published

      Identification of Salmonella Pullorum Factors Affecting Immune Reaction in Macrophages from the Avian Host

      Fei, Xiao, Li, Q., Jiao, X. & Olsen, John Elmerdahl, 2023, In: Microbiology Spectrum. 11, 3, e00786-23.

      Research output: Contribution to journal › Journal article › Research › peer-review

    19. Published

      Incidence and Genomic Background of Antibiotic Resistance in Food-Borne and Clinical Isolates of Salmonella enterica Serovar Derby from Spain

      Vázquez, X., García-Fierro, R., Fernández, J., Bances, M., Herrero-Fresno, A., Olsen, John Elmerdahl, Rodicio, R., Ladero, V., García, V. & Rodicio, M. R., 2023, In: Antibiotics. 12, 7, 1204.

      Research output: Contribution to journal › Journal article › Research › peer-review

    20. Published

      Lesions and pathogens found in pigs that died during the nursery period in five Danish farms

      Barington, Kristiane, Eriksen, E. Ø., Kudirkiene, E., Pankoke, K., Hartmann, Katrine Top, Hansen, Mette Sif, Jensen, Henrik Elvang, Blirup-Plum, Sophie Amalie, Jørgensen, B. M., Nielsen, Jens Peter, Olsen, John Elmerdahl, Goecke, Nicole Bakkegård, Larsen, Lars & Pedersen, Ken Steen, 2023, In: Porcine Health Management. 9, 26.

      Research output: Contribution to journal › Journal article › Research › peer-review

    21. Published

      Phenotypic and genotypic antimicrobial resistance correlation and plasmid characterization in Salmonella spp. isolates from Italy reveal high heterogeneity among serovars

      Petrin, S., Orsini, M., Massaro, A., Olsen, John Elmerdahl, Barco, L. & Losasso, C., 2023, In: Frontiers in Public Health. 11, 13 p., 1221351.

      Research output: Contribution to journal › Journal article › Research › peer-review

    22. Published

      Prevalence and whole genome phylogenetic analysis reveal genetic relatedness between antibiotic resistance Salmonella in hatchlings and older chickens from farms in Nigeria

      Jibril, A. H., Okeke, I. N., Dalsgaard, Anders & Olsen, John Elmerdahl, 2023, In: Poultry Science. 102, 3, 102427.

      Research output: Contribution to journal › Journal article › Research › peer-review

    23. Published

      The global transcriptomes of Salmonella enterica serovars Gallinarum, Dublin and Enteritidis in the avian host

      Fei, Xiao, Schroll, C., Huang, K., Christensen, Jens Peter, Christensen, Henrik, Lemire, S., Kilstrup, M., Thomsen, Line Elnif, Jelsbak, L. & Olsen, John Elmerdahl, 2023, In: Microbial Pathogenesis. 182, 106236.

      Research output: Contribution to journal › Journal article › Research › peer-review

    24. Published

      Uncovering the Important Genetic Factors for Growth during Cefotaxime-Gentamicin Combination Treatment in blaCTX-M-1 Encoding Escherichia coli

      Alobaidallah, M. S. A., García, V., De Mets, R., Wellner, Sandra Marina, Thomsen, Line Elnif, Herrero-Fresno, A. & Olsen, John Elmerdahl, 2023, In: Antibiotics. 12, 6, 24 p., 993.

      Research output: Contribution to journal › Journal article › Research › peer-review

    25. Published

      Whole strains vs MGEs in short and longterm transmission of ESBL genes between healthcare and community settings in Uganda

      Hounmanou, Yaovi Mahuton Gildas, Wanyana, A., Alafi, S., Wabwire-mangen, F., Christensen, Henrik, Olsen, John Elmerdahl & Byarugaba, D. K., 2023, In: Scientific Reports. 13, 10229.

      Research output: Contribution to journal › Journal article › Research › peer-review

    26. 2022
    27. Published

      ANTIBACTERIAL EFFECTS OF SINGLE AND COMBINED CRUDE EXTRACTS OF SYNADENIUM GLAUCESCENS AND COMMIPHORA SWYNNERTONII

      Ochollah, G. M., Msengwa, S. Z., Mabiki, P. F., Kusiluka, J. M. L., Mdegela, H. R. & Olsen, John Elmerdahl, 2022, In: African Journal of Infectious Diseases. 16, 2, p. 9-16 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    28. Published

      Antimicrobial-induced horizontal transfer of antimicrobial resistance genes in bacteria: a mini-review

      Liu, G., Thomsen, Line Elnif & Olsen, John Elmerdahl, 2022, In: The Journal of antimicrobial chemotherapy. 77, 3, p. 556-567 12 p.

      Research output: Contribution to journal › Review › Research › peer-review

    29. Published

      Effect of pH and Salinity on the Ability of Salmonella Serotypes to Form Biofilm

      Petrin, S., Mancin, M., Losasso, C., Deotto, S., Olsen, John Elmerdahl & Barco, L., 2022, In: Frontiers in Microbiology. 13, 821679.

      Research output: Contribution to journal › Journal article › Research › peer-review

    30. Published

      Evaluation of a novel multiplex qPCR method for rapid detection and quantification of pathogens associated with calf diarrhoea

      Pansri, P., Svensmark, B., Liu, G., Thamsborg, Stig Milan, Kudirkiene, E., Nielsen, H. V., Goecke, Nicole Bakkegård & Olsen, John Elmerdahl, 2022, In: Journal of Applied Microbiology. 133, 4, p. 2516-2527

      Research output: Contribution to journal › Journal article › Research › peer-review

    31. Published

      GENOMIC CHARACTERIZATION OF MULTIDRUG-RESISTANT EXTENDED-SPECTRUM β-LACTAMASE-PRODUCING ESCHERICHIA COLI AND KLEBSIELLA PNEUMONIAE FROM CHIMPANZEES (PAN TROGLODYTES) FROM WILD AND SANCTUARY LOCATIONS IN UGANDA

      Bager, S. L., Kakaala, I., Kudirkiene, E., Byarugaba, D. K. & Olsen, John Elmerdahl, 2022, In: Journal of Wildlife Diseases. 58, 2, p. 269-278 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    32. Published

      Garlic-Derived Metabolites Exert Antioxidant Activity, Modulate Gut Microbiota Composition and Limit Citrobacter rodentium Infection in Mice

      Zhu, L., Andersen-Civil, A. I. S., Castro-Meija, J. L., Nielsen, Dennis Sandris, Blanchard, A., Olsen, John Elmerdahl, Thamsborg, Stig Milan & Williams, Andrew Richard, 2022, In: Antioxidants. 11, 10, 14 p., 2033.

      Research output: Contribution to journal › Journal article › Research › peer-review

    33. Published

      Genome-wide analysis of fitness factors in uropathogenic Escherichia coli in a pig urinary tract infection model

      García, V., Stærk, K., Alobaidallah, M. S. A., Grønnemose, R. B., Guerra, Priscila Regina, Andersen, T. E., Olsen, John Elmerdahl & Herrero-Fresno, A., 2022, In: Microbiological Research. 265, p. 127202 1 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    34. Published

      Inhibition of Virulence Gene Expression in Salmonella Dublin, Escherichia coli F5 and Clostridium perfringens Associated With Neonatal Calf Diarrhea by Factors Produced by Lactic Acid Bacteria During Fermentation of Cow Milk

      Liu, G., Kragh, M. L., Aabo, S., Jensen, A. N. & Olsen, John Elmerdahl, 2022, In: Frontiers in Microbiology. 13, 828013.

      Research output: Contribution to journal › Journal article › Research › peer-review

    35. Published

      Prediction of Pasteurella multocida serotypes based on whole genomic sequences

      Christensen, Henrik, Sajid, S. M., Bisgaard, M., Magistrali, C. F., Massacci, F. R., Liman, M., Menke, T., Bischoff, H. & Olsen, John Elmerdahl, 2022, In: Veterinary Microbiology. 271, 109492.

      Research output: Contribution to journal › Journal article › Research › peer-review

    36. Published

      Proteomes of Uropathogenic Escherichia coli Growing in Human Urine and in J82 Urinary Bladder Cells

      Andersen, S., Nawrocki, A., Johansen, A. E., Herrero-Fresno, A., Menéndez, V. G., Møller-Jensen, J. & Olsen, John Elmerdahl, 2022, In: Proteomes. 10, 2, 15.

      Research output: Contribution to journal › Journal article › Research › peer-review

    37. Published

      Recommendations on diagnostic investigations of post-weaning diarrhea outbreaks: assessing the prevalence of diarrhea and determining microbiological etiologies

      Eriksen, E. Ø., Nielsen, Jens Peter, Kudirkiene, E., Olsen, John Elmerdahl, Goecke, Nicole Bakkegård, Larsen, Lars, Liu, G., Schmidt, Marianne Viuf Agerlin, Christensen, A. E. & Pedersen, Ken Steen, 2022.

      Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

    38. Published

      Whole Genome Sequencing (WGS) Analysis of Virulence and AMR Genes in Extended-Spectrum β-Lactamase (ESBL)-Producing Escherichia coli from Animal and Environmental Samples in Four Italian Swine Farms

      Bonvegna, M., Tomassone, L., Christensen, Henrik & Olsen, John Elmerdahl, 2022, In: Antibiotics. 11, 12, 1774.

      Research output: Contribution to journal › Journal article › Research › peer-review

    39. Published

      “Omics” Technologies - What Have They Told Us About Uropathogenic Escherichia coli Fitness and Virulence During Urinary Tract Infection?

      Torres-Puig, S., García, V., Stærk, K., Andersen, T. E., Møller-Jensen, J., Olsen, John Elmerdahl & Herrero-Fresno, A., 2022, In: Frontiers in Cellular and Infection Microbiology. 12, 824039.

      Research output: Contribution to journal › Review › Research › peer-review

    40. 2021
    41. Published

      Association between antimicrobial usage and resistance in Salmonella from poultry farms in Nigeria

      Jibril, A. H., Okeke, I. N., Dalsgaard, Anders & Olsen, John Elmerdahl, 2021, In: BMC Veterinary Research. 17, 234.

      Research output: Contribution to journal › Journal article › Research › peer-review

    42. Published

      Co-occurrence of antimicrobial and metal resistance genes in pig feces and agricultural fields fertilized with slurry

      Peng, S., Zheng, H., Herrero-Fresno, A., Olsen, John Elmerdahl, Dalsgaard, Anders & Ding, Z., 2021, In: Science of the Total Environment. 792, 148259.

      Research output: Contribution to journal › Journal article › Research › peer-review

    43. Published

      Duo: A Signature Based Method to Batch-Analyze Functional Similarities of Proteins

      Fei, Xiao, Li, Q., Olsen, John Elmerdahl & Jiao, X., 2021, In: Frontiers in Microbiology. 12, 698322.

      Research output: Contribution to journal › Journal article › Research › peer-review

    44. Published

      ESBL and AmpC β-Lactamase Encoding Genes in E. coli From Pig and Pig Farm Workers in Vietnam and Their Association With Mobile Genetic Elements

      Hounmanou, Yaovi Mahuton Gildas, Bortolaia, V., Dang, S. T. T., Truong, D., Olsen, John Elmerdahl & Dalsgaard, Anders, 2021, In: Frontiers in Microbiology. 12, 14 p., 629139.

      Research output: Contribution to journal › Journal article › Research › peer-review

    45. Published

      Genetic Comparison of ESBL-Producing Escherichia coli from Workers and Pigs at Vietnamese Pig Farms

      Truong, D. T. Q., Hounmanou, Yaovi Mahuton Gildas, Dang, S. T. T., Olsen, John Elmerdahl, Truong, G. T. H., Tran, N. T., Scheutz, F. & Dalsgaard, Anders, 2021, In: Antibiotics. 10, 10, 1165.

      Research output: Contribution to journal › Journal article › Research › peer-review

    46. Published

      Genome-wide analysis of fitness-factors in uropathogenic Escherichia coli during growth in laboratory media and during urinary tract infections

      García, V., Grønnemose, R. B., Torres-Puig, S., Kudirkiene, E., Piantelli, M., Ahmed, S., Andersen, T. E., Møller-Jensen, J., Olsen, John Elmerdahl & Herrero-Fresno, A., 2021, In: Microbial Genomics. 7, 12, 22 p., :000719.

      Research output: Contribution to journal › Journal article › Research › peer-review

    47. Published

      Genomic analysis of antimicrobial resistance and resistance plasmids in salmonella serovars from poultry in Nigeria

      Jibril, A. H., Okeke, I. N., Dalsgaard, Anders, Menéndez, V. G. & Olsen, John Elmerdahl, 2021, In: Antibiotics. 10, 2, p. 1-22 22 p., 99.

      Research output: Contribution to journal › Journal article › Research › peer-review

    48. Published

      Identification and characterization of a spreadable IncI1 plasmid harbouring a blaCTX-M-15 gene in an Italian human isolate of Salmonella serovar Napoli

      Petrin, S., Orsini, M., Mastrorilli, E., Longo, A., Cozza, D., Olsen, John Elmerdahl, Ricci, A., Losasso, C. & Barco, L., 2021, In: Plasmid. 114, 102566.

      Research output: Contribution to journal › Journal article › Research › peer-review

    49. Published

      Immunological and bacteriological shifts associated with a flagellin-hyperproducing Salmonella Enteritidis mutant in chickens

      de Oliveira Barbosa, F., de Freitas Neto, O. C., Rodrigues Alves, L. B., Benevides, V. P., de Souza, A. I. S., da Silva Rubio, M., de Almeida, A. M., Saraiva, M. M., de Oliveira, C. J. B., Olsen, John Elmerdahl & Junior, A. B., 2021, In: Brazilian Journal of Microbiology. 52, p. 419–429

      Research output: Contribution to journal › Journal article › Research › peer-review

    50. Published

      Occurrence of major and minor pathogens in calves diagnosed with bovine respiratory disease

      Kudirkiene, E., Aagaard, A. K., Schmidt, L. M. B., Pansri, P., Krogh, K. M. & Olsen, John Elmerdahl, 2021, In: Veterinary Microbiology. 259, 109135.

      Research output: Contribution to journal › Journal article › Research › peer-review

    51. Published

      Post-weaning diarrhea in pigs weaned without medicinal zinc: risk factors, pathogen dynamics, and association to growth rate

      Eriksen, E. Ø., Kudirkiene, E., Christensen, A. E., Schmidt, Marianne Viuf Agerlin, Weber, N. R., Nødtvedt, A., Nielsen, Jens Peter, Hartmann, Katrine Top, Skade, L., Larsen, Lars, Pankoke, K., Olsen, John Elmerdahl, Jensen, Henrik Elvang & Pedersen, Ken Steen, 2021, In: Porcine Health Management. 7, 54.

      Research output: Contribution to journal › Journal article › Research › peer-review

    52. Published

      Post-weaning diarrhea outbreaks in Danish herds not using medicinal zinc oxide

      Eriksen, E. Ø., Kudirkiene, E., Nielsen, Jens Peter, Olsen, John Elmerdahl & Pedersen, Ken Steen, 2021.

      Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

    53. Published

      Prediction of Mannheimia haemolytica serotypes based on whole genomic sequences

      Christensen, Henrik, Bisgaard, M., Menke, T., Liman, M., Timsit, E., Foster, G. & Olsen, John Elmerdahl, 2021, In: Veterinary Microbiology. 262, 109232.

      Research output: Contribution to journal › Journal article › Research › peer-review

    54. Published

      The effect of colistin treatment on the selection of colistin-resistant Escherichia coli in weaner pigs

      Ahmed, S., Hansen, C., Dahlkilde, A. L., Herrero-Fresno, A., Pedersen, Ken Steen, Nielsen, Jens Peter & Olsen, John Elmerdahl, 2021, In: Antibiotics. 10, 4, 465.

      Research output: Contribution to journal › Journal article › Research › peer-review

    55. 2020
    56. Published

      A bioinformatic approach to identify core genome difference between Salmonella Pullorum and Salmonella Enteritidis

      Fei, Xiao, Li, Q., Olsen, John Elmerdahl & Jiao, X., 2020, In: Infection, Genetics and Evolution. 85, 104446.

      Research output: Contribution to journal › Journal article › Research › peer-review

    57. Published

      A plasmid-encoded fetmp-fls iron uptake system confers selective advantages to salmonella enterica serovar typhimurium in growth under iron-restricted conditions and for infection of mammalian host cells

      García, V., Herrero-Fresno, A., Rodicio, R., Felipe-López, A., Montero, I., Olsen, John Elmerdahl, Hensel, M. & Rodicio, M. R., 2020, In: Microorganisms. 8, 5, 15 p., 630.

      Research output: Contribution to journal › Journal article › Research › peer-review

    58. Published

      Association of the prophage BTP1 and the prophage-encoded gene, bstA, with antivirulence of Salmonella Typhimurium ST313

      Spiegelhauer, M. R., García, V., Guerra, Priscila Regina, Olsen, John Elmerdahl & Herrero-Fresno, A., 2020, In: Pathogens and Disease. 78, 3, ftaa019.

      Research output: Contribution to journal › Journal article › Research › peer-review

    59. Published

      Combining Salmonella Dublin genome information and contact-tracing to substantiate a new approach for improved detection of infectious transmission routes in cattle populations

      de Knegt, Leonardo Victor, Kudirkiene, E., Rattenborg, E., Sørensen, G., Denwood, Matt, Olsen, John Elmerdahl & Nielsen, Liza Rosenbaum, 2020, In: Preventive Veterinary Medicine. 181, 104531 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    60. Published

      Dynamics and Outcome of Macrophage Interaction Between Salmonella Gallinarum, Salmonella Typhimurium, and Salmonella Dublin and Macrophages From Chicken and Cattle

      Huang, K., Fresno, A. H., Skov, Søren & Olsen, John Elmerdahl, 2020, In: Frontiers in Cellular and Infection Microbiology. 9, 12 p., 420.

      Research output: Contribution to journal › Journal article › Research › peer-review

    61. Published

      Effect of ampicillin, cephalexin, ceftiofur and tetracycline treatment on selection of resistant coliforms in a swine faecal microcosmos

      Herrero-Fresno, A. & Olsen, John Elmerdahl, 2020, In: Journal of Applied Microbiology. 129, 5, p. 1238-1247

      Research output: Contribution to journal › Journal article › Research › peer-review

    62. Published

      Epidemiology of Salmonella enterica Serovar Dublin in Cattleand Humans in Denmark, 1996 to 2016: a Retrospective Whole-Genome-Based Study

      Kudirkiene, E., Sørensen, G., Torpdahl, M., de Knegt, Leonardo Victor, Nielsen, Liza Rosenbaum, Rattenborg, E., Ahmed, S. & Olsen, John Elmerdahl, 2020, In: Applied and Environmental Microbiology. 86, 3, 12 p., e01894-19.

      Research output: Contribution to journal › Journal article › Research › peer-review

    63. Published

      Evaluation of novel multiplex qPCR assays for diagnosis of pathogens associated with the bovine respiratory disease complex

      Pansri, P., Katholm, J., Krogh, K. M., Aagaard, A. K., Schmidt, L. M. B., Kudirkiene, E., Larsen, Lars & Olsen, John Elmerdahl, 2020, In: Veterinary Journal. 256, 105425.

      Research output: Contribution to journal › Journal article › Research › peer-review

    64. Published

      F4- and F18-Positive Enterotoxigenic Escherichia coli Isolates from Diarrhea of Postweaning Pigs: Genomic Characterization

      García, V., Gambino, Michela, Pedersen, K., Haugegaard, S., Olsen, John Elmerdahl & Herrero-Fresno, A., 2020, In: Applied and Environmental Microbiology. 86, 23

      Research output: Contribution to journal › Journal article › Research › peer-review

    65. Published

      Global responses to oxytetracycline treatment in tetracycline-resistant Escherichia coli

      Møller, T. S. B., Liu, G., Hartman, H. B., Rau, M. H., Mortensen, S., Thamsborg, K., Johansen, A. E., Sommer, M. O. A., Guardabassi, Luca, Poolman, M. G. & Olsen, John Elmerdahl, 2020, In: Scientific Reports. 10, 1, 13 p., 8438.

      Research output: Contribution to journal › Journal article › Research › peer-review

    66. Published

      High prevalence of mcr-1-encoded colistin resistance in commensal Escherichia coli from broiler chicken in Bangladesh

      Ahmed, S., Das, T., Islam, M. Z., Herrero-Fresno, A., Biswas, P. K. & Olsen, John Elmerdahl, 2020, In: Scientific Reports. 10, 13 p., 18637.

      Research output: Contribution to journal › Journal article › Research › peer-review

    67. Published

      Indications for the use of highest priority critically important antimicrobials in the veterinary sector

      Lhermie, G., La Ragione, R. M., Weese, J. S., Olsen, John Elmerdahl, Christensen, Jens Peter & Guardabassi, Luca, 2020, In: The Journal of antimicrobial chemotherapy. 75, 7, p. 1671-1680 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    68. Published

      Influence of zinc on CTX-M-1 β-lactamase expression in Escherichia coli

      Peng, S., Herrero-Fresno, A., Olsen, John Elmerdahl & Dalsgaard, Anders, 2020, In: Journal of Global Antimicrobial Resistance. 22, p. 613-619 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    69. Published

      Molecular Characteristics and Zoonotic Potential of Salmonella Weltevreden From Cultured Shrimp and Tilapia in Vietnam and China

      Hounmanou, Yaovi Mahuton Gildas, Dalsgaard, Anders, Sopacua, T. F., Uddin, G. M. N., Leekitcharoenphon, P., Hendriksen, R. S., Olsen, John Elmerdahl & Larsen, M. H., 2020, In: Frontiers in Microbiology. 11, 1985.

      Research output: Contribution to journal › Journal article › Research › peer-review

    70. Published

      Polyamine depletion has global effects on stress and virulence gene expression and affects HilA translation in Salmonella enterica serovar typhimurium

      Guerra, Priscila Regina, Liu, G., Lemire, S., Nawrocki, A., Kudirkiene, E., Møller-Jensen, J., Olsen, John Elmerdahl & Jelsbak, L., 2020, In: Research in Microbiology. 17, 3-4, p. 143-152

      Research output: Contribution to journal › Journal article › Research › peer-review

    71. Published

      Prevalence and genomic characterization of Salmonella Weltevreden in commercial pig feed

      Minh, D. K., Hounmanou, Yaovi Mahuton Gildas, Mai, H. B. T., Olsen, John Elmerdahl & Dalsgaard, Anders, 2020, In: Veterinary Microbiology. 246, 108725.

      Research output: Contribution to journal › Journal article › Research › peer-review

    72. Published

      Prevalence and risk factors of Salmonella in commercial poultry farms in Nigeria

      Jibril, A. H., Okeke, I. N., Dalsgaard, Anders, Kudirkiene, E., Akinlabi, O. C., Bello, M. B. & Olsen, John Elmerdahl, 2020, In: PLoS ONE. 15, 9, p. 17 e0238190.

      Research output: Contribution to journal › Journal article › Research › peer-review

    73. Published

      Research note: Occurrence of mcr-encoded colistin resistance in Escherichia coli from pigs and pig farm workers in Vietnam

      Dang, S. T. T., Truong, D. T. Q., Olsen, John Elmerdahl, Tran, N. T., Truong, G. T. H., Vu, H. T. K. & Dalsgaard, Anders, 2020, In: FEMS Microbes. 1, 1, 6 p., xtaa003.

      Research output: Contribution to journal › Journal article › Research › peer-review

    74. 2019
    75. Published

      Antibiotic-Induced, Increased Conjugative Transfer Is Common to Diverse Naturally Occurring ESBL Plasmids in Escherichia coli

      Liu, G., Bogaj, K., Bortolaia, V., Olsen, John Elmerdahl & Thomsen, Line Elnif, 2019, In: Frontiers in Microbiology. 10, 2119.

      Research output: Contribution to journal › Journal article › Research › peer-review

    76. Published

      Cholera hotspots and surveillance constraints contributing to recurrent epidemics in Tanzania

      Hounmanou, Yaovi Mahuton Gildas, Mølbak, Kåre, Kähler, J., Mdegela, R. H., Olsen, John Elmerdahl & Dalsgaard, Anders, 2019, In: BMC Research Notes. 12, 6 p., 664.

      Research output: Contribution to journal › Journal article › Research › peer-review

    77. Published

      Effect of tetracycline treatment regimens on antibiotic resistance gene selection over time in nursery pigs

      Græsbøll, K., Larsen, Inge, Clasen, J., Birkegård, A. C., Nielsen, Jens Peter, Christiansen, L. E., Olsen, John Elmerdahl, Angen, Ø. & Folkesson, A., 2019, In: BMC Microbiology. 19, 1, 10 p., 269.

      Research output: Contribution to journal › Journal article › Research › peer-review

    78. Published

      Factors influencing Danish veterinarians’ choice of antimicrobials prescribed for intestinal diseases in weaner pigs

      Eriksen, E. Ø., Smed, S., Klit, K. J. M. & Olsen, John Elmerdahl, 2019, In: Veterinary Record. 184, 26, 10 p., 798.

      Research output: Contribution to journal › Journal article › Research › peer-review

    79. Published

      Genomic insights into Vibrio cholerae O1 responsible for cholera epidemics in Tanzania between 1993 and 2017

      Hounmanou, Yaovi Mahuton Gildas, Leekitcharoenphon, P., Kudirkiene, E., Mdegela, R. H., Hendriksen, R. S., Olsen, John Elmerdahl & Dalsgaard, Anders, 2019, In: PLOS Neglected Tropical Diseases . 13, 12, 14 p., e0007934.

      Research output: Contribution to journal › Journal article › Research › peer-review

    80. Published

      Identification of Genes Essential for Antibiotic-Induced Up-Regulation of Plasmid-Transfer-Genes in Cephalosporin Resistant Escherichia coli

      Liu, G., Olsen, John Elmerdahl & Thomsen, Line Elnif, 2019, In: Frontiers in Microbiology. 10, 9 p., 2203.

      Research output: Contribution to journal › Journal article › Research › peer-review

    81. Published

      Infectious potential of human derived uropathogenic Escherichia coli UTI86 in the reproductive tract of laying hens

      Mortensen, S., Johansen, A. E., Thoefner, Ida , Christensen, Jens Peter, Pors, S. E., Fresno, A. H., Møller-Jensen, J. & Olsen, John Elmerdahl, 2019, In: Veterinary Microbiology. 239, 108445.

      Research output: Contribution to journal › Journal article › Research › peer-review

    82. Published

      Interaction differences of the avian host-specific salmonella enterica serovar gallinarum, the host-generalist S. Typhimurium, and the cattle host-adapted S. Dublin with chicken primary macrophage

      Huang, K., Herrero-Fresno, A., Thoefner, Ida , Skov, Søren & Olsen, John Elmerdahl, 2019, In: Infection and Immunity. 87, 12, e00552-19.

      Research output: Contribution to journal › Journal article › Research › peer-review

    83. Published

      Reclassification of Bisgaard taxon 37 and taxon 44 as Psittacicella melopsittaci gen. nov., sp. nov., Psittacicella hinzii sp. nov. and Psittacicella gerlachiana sp. nov. within Psittacicellaceae fam. nov. of the order Pasteurellales

      Xin, D., Bisgaard, M., Busse, H. J., Olsen, Rikke Heidemann, Hess, C., Aalbæk, Bent, Olsen, John Elmerdahl & Christensen, Henrik, 2019, In: International Journal of Systematic and Evolutionary Microbiology. 69, 2, p. 350-355 6 p., 003133.

      Research output: Contribution to journal › Journal article › Research › peer-review

    84. Published

      Surveillance and Genomics of Toxigenic Vibrio cholerae O1 From Fish, Phytoplankton and Water in Lake Victoria, Tanzania

      Hounmanou, Yaovi Mahuton Gildas, Leekitcharoenphon, P., Hendriksen, R. S., Dougnon, T. V., Mdegela, R. H., Olsen, John Elmerdahl & Dalsgaard, Anders, 2019, In: Frontiers in Microbiology. 10, 15 p., 901.

      Research output: Contribution to journal › Journal article › Research › peer-review

    85. Published

      The SPI-19 encoded type-six secretion-systems (T6SS) of Salmonella enterica serovars Gallinarum and Dublin play different roles during infection

      Schroll, C., Huang, K., Ahmed, S., Kristensen, B. M., Pors, S. E., Jelsbak, L., Lemire, S., Thomsen, Line Elnif, Christensen, Jens Peter, Jensen, P. R. & Olsen, John Elmerdahl, 2019, In: Veterinary Microbiology. 230, p. 23-31 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    86. Published

      Tilapia (Oreochromis niloticus) as a Putative Reservoir Host for Survival and Transmission of Vibrio cholerae O1 Biotype El Tor in the Aquatic Environment

      Hounmanou, Yaovi Mahuton Gildas, Mdegela, R. H., Dougnon, T. V., Madsen, Henry, Withey, J. H., Olsen, John Elmerdahl & Dalsgaard, Anders, 2019, In: Frontiers in Microbiology. 10, 14 p., 1215.

      Research output: Contribution to journal › Journal article › Research › peer-review

    87. Published

      WGS based study of the population structure of Salmonella enterica serovar Infantis

      Gymoese, Pernille, Kiil, K., Torpdahl, M., Østerlund, M. T., Sørensen, G., Olsen, John Elmerdahl, Nielsen, E. M. & Litrup, E., 2019, In: BMC Genomics. 20, 1, 11 p., 870.

      Research output: Contribution to journal › Journal article › Research › peer-review

    88. 2018
    89. Published

      The Use of a Combined Bioinformatics Approach to Locate Antibiotic Resistance Genes on Plasmids From Whole Genome Sequences of Salmonella enterica Serovars From Humans in Ghana

      Kudirkiene, E., Andoh, L. A., Ahmed, S., Herrero Fresno, A., Dalsgaard, Anders, Obiri-Danso, K. & Olsen, John Elmerdahl, 17 May 2018, In: Frontiers in Microbiology. 9, 14 p., 1010.

      Research output: Contribution to journal › Journal article › Research › peer-review

    90. Published

      The membrane transporter PotE is required for virulence in avian pathogenic Escherichia coli (APEC)

      Guerra, Priscila Regina, Herrero-Fresno, A., Pors, S. E., Ahmed, S., Wang, D., Thoefner, Ida , Antenucci, F. & Olsen, John Elmerdahl, Mar 2018, In: Veterinary Microbiology. 216, p. 38-44 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    91. Published

      Prevalence of genetic determinants and phenotypic resistance to ciprofloxacin in Campylobacter jejuni from lithuania

      Aksomaitiene, J., Ramonaite, S., Olsen, John Elmerdahl & Malakauskas, M., Feb 2018, In: Frontiers in Microbiology. 9, 2, 6 p., 203.

      Research output: Contribution to journal › Journal article › Research › peer-review

    92. Published

      Investigation of the role of genes encoding zinc exporters zntA, zitB, and fieF during Salmonella typhimurium infection

      Huang, K., Wang, D., Frederiksen, R. F., Rensing, C., Olsen, John Elmerdahl & Fresno, A. H., Jan 2018, In: Frontiers in Microbiology. 8, 1, 11 p., 2656.

      Research output: Contribution to journal › Journal article › Research › peer-review

    93. Published

      Isolation of vancomycin-resistant Enterococcus from apparently healthy human animal attendants, cattle and cattle wastes in Tanzania

      Madoshi, B. P., Mtambo, M. M. A., Muhairwa, A. P., Lupindu, A. M. & Olsen, John Elmerdahl, Jan 2018, In: Journal of Applied Microbiology. 124, 5, p. 1303-1310 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    94. Published

      The Homolog of the Gene bstA of the BTP1 Phage from Salmonella enterica Serovar Typhimurium ST313 Is an Antivirulence Gene in Salmonella enterica Serovar Dublin

      Herrero-Fresno, A., Espinel, I. C., Spiegelhauer, M. R., Guerra, Priscila Regina, Andersen, Karsten Wiberg & Olsen, John Elmerdahl, Jan 2018, In: Infection and Immunity. 86, 1, 12 p., e00784-17.

      Research output: Contribution to journal › Journal article › Research › peer-review

    95. Published

      First Report on a Randomized Investigation of Antimicrobial Resistance in Fecal Indicator Bacteria from Livestock, Poultry, and Humans in Tanzania

      Katakweba, A. A. S., Muhairwa, A. P., Lupindu, A. M., Damborg, Peter Panduro, Rosenkrantz, J. T., Minga, U. M., Mtambo, M. M. A. & Olsen, John Elmerdahl, 2018, In: Microbial Drug Resistance. 24, 3, p. 260-268 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    96. Published

      Optimization of Antimicrobial Treatment to Minimize Resistance Selection

      Guardabassi, Luca, Apley, M., Olsen, John Elmerdahl, Toutain, P. L. & Weese, S., 2018, Antimicrobial Resistance in Bacteria from Livestock and Companion Animals. ASM Press, p. 637-674 (Microbiology Spectrum).

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review

    97. Published

      Putrescine biosynthesis and export genes are essential for normal growth of avian pathogenic Escherichia coli

      Guerra, Priscila Regina, Herrero-Fresno, A., Ladero, V., Redruello, B., Dos Santos, T. P., Spiegelhauer, M. R., Jelsbak, L. & Olsen, John Elmerdahl, 2018, In: BMC Microbiology. 18, 12 p., 226.

      Research output: Contribution to journal › Journal article › Research › peer-review

    98. Published

      Salmonella Typhimurium metabolism affects virulence in the host – A mini-review

      Herrero-fresno, A. & Olsen, John Elmerdahl, 2018, In: Food Microbiology. 71, p. 98-110

      Research output: Contribution to journal › Journal article › Research › peer-review

    99. Published

      The impact of inactivation of the purine biosynthesis genes, purN and purT, on growth and virulence in uropathogenic E. coli

      Andersen-Civil, A. I. S., Ahmed, S., Guerra, Priscila Regina, Andersen, T. E., Hounmanou, Yaovi Mahuton Gildas, Olsen, John Elmerdahl & Herrero-Fresno, A., 2018, In: Molecular Biology Reports. 45, 6, p. 2707-2716 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    100. 2017
    101. Published

      Treatment with cefotaxime affects expression of conjugation associated proteins and conjugation transfer frequency of an IncI1 plasmid in Escherichia coli

      Møller, T. S. B., Liu, G., Boysen, A., Thomsen, Line Elnif, Lüthje, F. L., Mortensen, S., Møller-Jensen, J. & Olsen, John Elmerdahl, 29 Nov 2017, In: Frontiers in Microbiology. 8, 2365.

      Research output: Contribution to journal › Journal article › Research › peer-review

    102. Published

      Chromosomal features of Escherichia coli serotype O2:K2, an avian pathogenic E. coli

      Jørgensen, S. L., Kudirkiene, E., Li, L., Christensen, Jens Peter, Olsen, John Elmerdahl, Nolan, L. K. & Olsen, Rikke Heidemann, 10 May 2017, In: Standards in Genomic Sciences. 12, 9 p., 33.

      Research output: Contribution to journal › Journal article › Research › peer-review

    103. Published

      Genotype variation and genetic relationship among Escherichia coli from nursery pigs located in different pens in the same farm

      Herrero-Fresno, A., Ahmed, S., Hansen, M. H., Denwood, Matt, Zachariasen, C. & Olsen, John Elmerdahl, 5 Jan 2017, In: BMC Microbiology. 17, 10 p., 5.

      Research output: Contribution to journal › Journal article › Research › peer-review

    104. Published

      Effect of different oral oxytetracycline treatment regimes on selection of antimicrobial resistant coliforms in nursery pigs

      Herrero-Fresno, A., Zachariasen, C., Nørholm, N., Holm, A., Christiansen, L. E. & Olsen, John Elmerdahl, 2017, In: Veterinary Microbiology. 208, p. 1-7 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    105. Published

      Effect of tetracycline dose and treatment mode on selection of resistant coliform bacteria in nursery pigs

      Græsbøll, K., Damborg, Peter Panduro, Mellerup, A., Herrero-Fresno, A., Larsen, Inge, Holm, A., Nielsen, Jens Peter, Christiansen, L. E., Angen, Ø., Ahmed, S., Folkesson, A. & Olsen, John Elmerdahl, 2017, In: Applied and Environmental Microbiology. 83, 12, 12 p., e00538-17.

      Research output: Contribution to journal › Journal article › Research › peer-review

    106. Published

      Genetic clusters and circulation of Salmonella Dublin in Jutland

      de Knegt, Leonardo Victor, Kudirkiene, E., Sorensen, G., Nielsen, Liza Rosenbaum & Olsen, John Elmerdahl, 2017. 1 p.

      Research output: Contribution to conference › Poster › Research › peer-review

    107. Published

      Insight into synergetic mechanisms of tetracycline and the selective serotonin reuptake inhibitor, sertraline, in a tetracycline-resistant strain of Escherichia coli

      Li, L., Kromann, Sofie, Olsen, John Elmerdahl, Svenningsen, Søren Wedel & Olsen, Rikke Heidemann, 2017, In: Journal of Antibiotics. 70, 9, p. 944-953 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    108. Published

      Investigation of outbreaks of Salmonella enterica serovar typhimurium and its monophasic variants using whole-genome sequencing, Denmark

      Gymoese, Pernille, Sørensen, G., Litrup, E., Olsen, John Elmerdahl, Nielsen, E. M. & Torpdahl, M., 2017, In: Emerging Infectious Diseases . 23, 10, p. 1631-1639 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    109. Published

      Prevalence and characterization of Salmonella among humans in Ghana

      Andoh, L. A., Ahmed, S., Olsen, John Elmerdahl, Obiri-Danso, K., Newman, M. J., Opintan, J. A., Barco, L. & Dalsgaard, Anders, 2017, In: Tropical Medicine and Health. 45, 11 p., 3.

      Research output: Contribution to journal › Journal article › Research › peer-review

    110. Published

      Repetitive element sequence-based pcr typing for improved discrimination of Campylobacter Jejuni

      Malakauskas, M., Malakauskas, A., Christensen, Henrik, Olsen, John Elmerdahl & Brogren, C. H., 2017, In: Veterinarija ir Zootechnika. 75, 97, p. 43-53 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    111. Published

      Risk factors for episodes of enteric disease in cattle wastes handlers in Tanzania

      Madoshi, B., Lupindu, A. M., Mtambo, M., Muhairwa, A. P. & Olsen, John Elmerdahl, 2017, In: Tanzania Veterinary Journal. 32, 1, p. 41-47

      Research output: Contribution to journal › Journal article › Research › peer-review

    112. Published

      The genetic diversity of commensal Escherichia coli strains isolated from nonantimicrobial treated pigs varies according to age group

      Ahmed, S., Olsen, John Elmerdahl & Herrero-Fresno, A., 2017, In: PLoS ONE. 12, 5, 18 p., e0178623.

      Research output: Contribution to journal › Journal article › Research › peer-review

    113. 2016
    114. Published

      Characterisation of commensal Escherichia coli isolated from apparently healthy cattle and their attendants in Tanzania

      Madoshi, B., Kudirkiene, E., Mtambo, M., Muhairva, A., Lupindu, A. & Olsen, John Elmerdahl, 15 Dec 2016, In: P L o S One. 11, 12, 19 p., e0168160.

      Research output: Contribution to journal › Journal article › Research › peer-review

    115. Published

      Prevalence of feline haemoplasma in cats in Denmark

      Rosenqvist, M. B., Meilstrup, A. H., Larsen, J., Olsen, John Elmerdahl, Jensen, Asger Lundorff & Thomsen, Line Elnif, 10 Nov 2016, In: Acta Veterinaria Scandinavica (Online). 58, 5 p., 78.

      Research output: Contribution to journal › Journal article › Research › peer-review

    116. Published

      Prevalence and antimicrobial resistance of Salmonella serovars isolated from poultry in Ghana

      Andoh, L. A., Dalsgaard, Anders, Obiri-Danso, K., Newman, M. J., Barco, L. & Olsen, John Elmerdahl, Nov 2016, In: Epidemiology and Infection. 144, 15, p. 3288-3299 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    117. Published

      Modeling the growth dynamics of multiple Escherichia coli strains in the pig intestine following intramuscular ampicillin treatment

      Ahmad, A., Zachariasen, C., Christiansen, L. E., Græsbøll, K., Toft, N., Matthews, L., Nielsen, Søren Saxmose & Olsen, John Elmerdahl, 6 Sep 2016, In: BMC Microbiology. 16, 1, 10 p., 205.

      Research output: Contribution to journal › Journal article › Research › peer-review

    118. Published

      Adaptive responses to cefotaxime treatment in ESBL-producing Escherichia coli and the possible use of significantly regulated pathways as novel secondary targets

      Møller, T. S. B., Rau, M. H., Bonde, C. S., Sommer, M. O. A., Guardabassi, Luca & Olsen, John Elmerdahl, Sep 2016, In: Journal of Antimicrobial Chemotherapy. 71, 9, p. 2449-2459 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    119. Published

      The In Vitro Redundant Enzymes PurN and PurT Are Both Essential for Systemic Infection of Mice in Salmonella enterica Serovar Typhimurium

      Jelsbak, L., Mortensen, M. I. B., Kilstrup, M. & Olsen, John Elmerdahl, Jul 2016, In: Infection and Immunity. 84, 7, p. 2076-2085

      Research output: Contribution to journal › Journal article › Research › peer-review

    120. Published

      Determining the optimal number of individual samples to pool for quantification of average herd levels of antimicrobial resistance genes in Danish pig herds using high-throughput qPCR

      Clasen, J., Mellerup, A., Olsen, John Elmerdahl, Angen, Ø., Folkesson, A., Halasa, T., Toft, N. & Birkegard, A. C., 30 Jun 2016, In: Veterinary Microbiology. 189, p. 46-51

      Research output: Contribution to journal › Journal article › Research › peer-review

    121. Published

      Multistrain models predict sequential multidrug treatment strategies to result in less antimicrobial resistance than combination treatment

      Ahmad, A., Zachariasen, C., Christiansen, L. E., Græsbøll, K., Toft, N., Matthews, L., Olsen, John Elmerdahl & Nielsen, Søren Saxmose, 23 Jun 2016, In: B M C Microbiology. 16, 10 p., 118.

      Research output: Contribution to journal › Journal article › Research › peer-review

    122. Published

      Highly expressed amino acid biosynthesis genes revealed by global gene expression analysis of Salmonella enterica serovar Enteritidis during growth in whole egg are not essential for this growth

      Jakociune, D., Herrero-Fresno, A., Jelsbak, L. & Olsen, John Elmerdahl, 2 May 2016, In: International Journal of Food Microbiology. 224, p. 40-46

      Research output: Contribution to journal › Journal article › Research › peer-review

    123. Published

      Relation between tetR and tetA expression in tetracycline resistant Escherichia coli

      Møller, T. S. B., Overgaard, M., Nielsen, Søren Saxmose, Bortolaia, V., Sommer, M. O. A., Guardabassi, Luca & Olsen, John Elmerdahl, 12 Mar 2016, In: BMC Microbiology. 16, 8 p., 39.

      Research output: Contribution to journal › Journal article › Research › peer-review

    124. Published

      The efficacy of oxytetracycline treatment at batch, pen and individual level on Lawsonia intracellularis infection in nursery pigs in a randomised clinical trial

      Larsen, Inge, Nielsen, Søren Saxmose, Olsen, John Elmerdahl & Nielsen, Jens Peter, 1 Feb 2016, In: Preventive Veterinary Medicine. 124, p. 25-33 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    125. Published

      spa typing and antimicrobial resistance of Staphylococcus aureus from healthy humans, pigs and dogs in Tanzania

      Katakweba, A. S., Muhairwa, A. P., Espinosa-Gongora, C., Guardabassi, Luca, Mtambo, M. M. & Olsen, John Elmerdahl, Feb 2016, In: Journal of Infection in Developing Countries. 10, 2, p. 143-148

      Research output: Contribution to journal › Journal article › Research › peer-review

    126. Published

      A randomised clinical trial on the efficacy of oxytetracycline dose through water medication of nursery pigs on diarrhoea, faecal shedding of Lawsonia intracellularis and average daily weight gain

      Larsen, Inge, Hjulsager, C. K., Holm, A., Olsen, John Elmerdahl, Nielsen, Søren Saxmose & Nielsen, Jens Peter, 1 Jan 2016, In: Preventive Veterinary Medicine. 123, p. 52-59 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    127. Published

      Apramycin treatment affects selection and spread of a multidrug-resistant Escherichia coli strain able to colonize the human gut in the intestinal microbiota of pigs

      Herrero Fresno, A., Zachariasen, C., Hansen, M. H., Nielsen, A. S., Hendriksen, R. S., Nielsen, Søren Saxmose & Olsen, John Elmerdahl, 2016, In: Veterinary Research. 47, 10 p., 12.

      Research output: Contribution to journal › Journal article › Research › peer-review

    128. Published

      Enteral but not parenteral antibiotics enhance gut function and prevent necrotizing enterocolitis in formula-fed newborn preterm pigs

      Birck, M. M., Nguyen, Duc Ninh, Cilieborg, Malene Skovsted, Bin Shamzir Kamal, S., Nielsen, Dennis Sandris, Damborg, Peter Panduro, Olsen, John Elmerdahl, Lauridsen, C., Sangild, Per Torp & Thymann, Thomas, 2016, In: American Journal of Physiology: Gastrointestinal and Liver Physiology. 310, 5, p. G323-G333 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    129. 2015
    130. Published

      Pharmacodynamic modelling of in vitro activity of tetracycline against a representative, naturally occurring population of porcine Escherichia coli

      Ahmad, A., Zachariasen, C., Christiansen, L. E., Græsbøll, K., Toft, N., Matthews, L., Damborg, Peter Panduro, Agersø, Y., Olsen, John Elmerdahl & Nielsen, Søren Saxmose, Nov 2015, In: Acta Veterinaria Scandinavica (Online). 57, 8 p., 79.

      Research output: Contribution to journal › Journal article › Research › peer-review

    131. Published

      Genetic relatedness of commensal Escherichia coli from nursery pigs in intensive pig production in Denmark and molecular characterization of genetically different strains

      Herrero Fresno, A., Larsen, Inge & Olsen, John Elmerdahl, Aug 2015, In: Journal of Applied Microbiology. 119, 2, p. 342-353 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    132. Published

      Sampling and pooling methods for capturing herd level antibiotic resistance in swine feces using qPCR and CFU approaches

      Schmidt, G. V., Mellerup, A., Christiansen, L. E., Ståhl, M., Olsen, John Elmerdahl & Angen, Ø., 26 Jun 2015, In: PloS one. 10, 6, 22 p., e0131672.

      Research output: Contribution to journal › Journal article › Research › peer-review

    133. Published

      Importance of sigma factor mutations in increased triclosan resistance in Salmonella Typhimurium

      Gantzhorn, M. R., Olsen, John Elmerdahl & Thomsen, Line Elnif, 19 May 2015, In: B M C Microbiology. 15, 9 p., 105.

      Research output: Contribution to journal › Journal article › Research › peer-review

    134. Published

      Persistence of vancomycin resistance in multiple clones of Enterococcus faecium isolated from Danish broilers 15 years after the ban of avoparcin

      Bortolaia, V., Mander, M., Jensen, L. B., Olsen, John Elmerdahl & Guardabassi, Luca, May 2015, In: Antimicrobial Agents and Chemotherapy. 59, 5, p. 2926-2929 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    135. Published

      Ascertaining the relationship between Salmonella Typhimurium and Salmonella 4,[5],12:i:- by MLVA and inferring the sources of human salmonellosis due to the two serovars in Italy

      Barco, L., Barrucci, F., Cortini, E., Ramon, E., Olsen, John Elmerdahl, Luzzi, I., Lettini, A. A. & Ricci, A., 27 Apr 2015, In: Frontiers in Microbiology. 6, 10 p., 301.

      Research output: Contribution to journal › Journal article › Research › peer-review

    136. Published

      Antimicrobial resistance in faecal samples from buffalo, wildebeest and zebra grazing together with and without cattle in Tanzania

      Katakweba, A. A. S., Møller, K. S., Muumba, J., Muhairwa, A. P., Damborg, Peter Panduro, Rosenkrantz, J. T., Minga, U. M., Mtambo, M. M. A. & Olsen, John Elmerdahl, Apr 2015, In: Journal of Applied Microbiology. 118, 4, p. 966-975 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    137. Published

      Extended spectrum β-lactamase-producing Escherichia coli forms filaments as an initial response to cefotaxime treatment

      Møller, T. S. B., Sommer, M. O. A. & Olsen, John Elmerdahl, Mar 2015, In: B M C Microbiology. 15, 6 p., 63.

      Research output: Contribution to journal › Journal article › Research › peer-review

    138. Published

      CTX-M-1 β-lactamase expression in Escherichia coli is dependent on cefotaxime concentration, growth phase and gene location

      Kjeldsen, T. S. B., Overgaard, M., Nielsen, Søren Saxmose, Bortolaia, V., Jelsbak, L., Sommer, M., Guardabassi, Luca & Olsen, John Elmerdahl, 2015, In: Journal of Antimicrobial Chemotherapy. 70, 1, p. 62-70 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    139. Published

      Mindset of urban and peri-urban dairy cattle keepers in Morogoro, Tanga and Temeke Districts, Tanzania

      Mlozi, M. R. S., Mtambo, M. M. A. & Olsen, John Elmerdahl, 2015, In: Livestock Research for Rural Development (Online Edition). 27, 2, 38.

      Research output: Contribution to journal › Journal article › Research › peer-review

    140. Published

      The consequence of low mannose-binding lectin plasma concentration in relation to susceptibility to Salmonella Infantis in chickens

      Ulrich-Lynge, S. L., Dalgaard, T. S., Norup, L. R., Kjærup, R. M., Olsen, John Elmerdahl, Sørensen, P. & Juul-Madsen, H. R., 2015, In: Veterinary Immunology and Immunopathology. 163, 1-2, p. 23-32 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    141. Published

      Transmission of antibiotic-resistant Escherichia coli between cattle, humans and the environment in peri-urban livestock keeping communities in Morogoro, Tanzania

      Lupindu, A. M., Dalsgaard, Anders, Msoffe, P. L. M., Ngowi, H. A., Mtambo, M. M. & Olsen, John Elmerdahl, 2015, In: Preventive Veterinary Medicine. 118, 4, p. 477-482 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    142. Published

      Whole-genome sequence of Staphylococcus aureus S54F9 isolated from a chronic disseminated porcine lung abscess and used in human infection models

      Aalbæk, Bent, Jensen, Louise Kruse, Jensen, Henrik Elvang, Olsen, John Elmerdahl & Christensen, Henrik, 2015, In: Genome Announcements. 3, 5, 2 p., e01207-15.

      Research output: Contribution to journal › Journal article › Research › peer-review

    143. 2014
    144. Published

      Analysis of the contribution of bacteriophage ST64B to in vitro virulence traits of Salmonella enterica serovar Typhimurium

      Herrero Fresno, A., Leekitcharoenphon, P., Hendriksen, R. S., Olsen, John Elmerdahl & Aarestrup, F. M., 2014, In: Journal of Medical Microbiology. 63, 3, p. 331-342 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    145. Published

      Biocide and antibiotic susceptibility of Salmonella isolates obtained before and after cleaning at six Danish pig slaughterhouses

      Gantzhorn, M. R., Pedersen, K., Olsen, John Elmerdahl & Thomsen, Line Elnif, 2014, In: International Journal of Food Microbiology. 181, p. 53-59 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    146. Published

      Demonstration of persistent contamination of a cooked egg product production facility with Salmonella enterica serovar Tennessee and characterization of the persistent strain

      Jakociune, D., Bisgaard, M., Pedersen, K. & Olsen, John Elmerdahl, 2014, In: Journal of Applied Microbiology. 117, 2, p. 547-553 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    147. Published

      Effects of environmental conditions on growth and survival of Salmonella in pasteurized whole egg

      Jakociune, D., Bisgaard, M., Hervé, G., Protais, J., Olsen, John Elmerdahl & Chemaly, M., 2014, In: International Journal of Food Microbiology. 184, p. 27-30 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    148. Published

      Enumeration of Salmonella in table eggs, pasteurized egg products and egg-containing dishes by using quantitative real-time PCR

      Jakociune, D., Pasquali, F., da Silva, C. S., Löfström, C., Hoorfar, J., Klein, G., Manfreda, G. & Olsen, John Elmerdahl, 2014, In: Applied and Environmental Microbilogy. 80, 5, p. 1616-1622 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    149. Published

      European validation of Real-Time PCR method for detection of Salmonella spp. in pork meat

      Delibato, E., Lazaro, D. R., Gianfranceschi, M., De Cesare, A., Comin, D., Gattuso, A., Hernandez, M., Sonnessa, M., Pasquali, F., Sreter-Lancz, Z., Jakociune, D. & Olsen, John Elmerdahl, 2014, In: International Journal of Food Microbiology. 184, p. 134-138 5 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    150. Published

      European validation of a real-time PCR-based method for detection of Listeria monocytogenes in soft cheese

      Gianfranceschi, M. V., Rodriguez-Lazaro, D., Hernandez, M., González-García, P., Comin, D., Gattuso, A., Delibato, E., Sonnessa, M., Pasquali, F., Prencipe, V., Jakociune, D. & Olsen, John Elmerdahl, 2014, In: International Journal of Food Microbiology. 184, p. 128-133 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    151. Published

      Identification of metabolic pathways essential for fitness of Salmonella Typhimurium In Vivo

      Jelsbak, L., Hartman, H., Schroll, C., Rosenkrantz, J. T., Lemire, S., Wallrodt, I., Thomsen, Line Elnif, Poolman, M., Kilstrup, M., Jensen, P. R. & Olsen, John Elmerdahl, 2014, In: P L o S One. 9, 7, 7 p., e101869.

      Research output: Contribution to journal › Journal article › Research › peer-review

    152. Published

      Identification of potential drug targets in Salmonella enterica sv. Typhimurium using metabolic modelling and experimental validation

      Hartman, H. B., Fell, D. A., Rossell, S., Jensen, P. R., Woodward, M. J., Thorndahl, L., Jelsbak, L., Olsen, John Elmerdahl, Raghunathan, A., Daefler, S. & Poolman, M. G., 2014, In: Microbiology-Sgm. 160, 6, p. 1252-1266 15 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    153. Published

      Improvement of sampling plans for Salmonella detection in pooled table eggs by use of real-time PCR

      Pasquali, F., De Cesare, A., Valero, A., Olsen, John Elmerdahl & Manfreda, G., 2014, In: International Journal of Food Microbiology. 184, p. 31-34 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    154. Published

      Molecular characterization of "inconsistent" variants of Salmonella Typhimurium isolated in Italy

      Barco, L., Longo, A., Lettini, A. A., Cortini, E., Saccardin, C., Minorello, C., Olsen, John Elmerdahl & Ricci, A., 2014, In: Foodborne pathogens and disease. 11, 6, p. 497-499 3 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    155. Published

      Molecular characterization of Salmonella enterica serovar 4,[5],12:i:- DT193 ASSuT strains from two outbreaks in Italy

      Barco, L., Ramon, E., Cortini, E., Longo, A., Dalla Pozza, M. C., Lettini, A. A., Dionisi, A. M., Olsen, John Elmerdahl & Ricci, A., 2014, In: Foodborne pathogens and disease. 11, 2, p. 138-144 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    156. Published

      Occurrence and characterization of Shiga toxin-producing Escherichia coli O157:H7 and other non-sorbitol-fermenting E. coli in cattle and humans in urban areas of Morogoro, Tanzania

      Lupindu, A. M., Olsen, John Elmerdahl, Ngowi, H. A., Msoffe, P. L. M., Mtambo, M. M., Scheutz, F. & Dalsgaard, Anders, 2014, In: Vector Borne and Zoonotic Diseases. 14, 7, p. 503-510 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    157. Published

      Polyamines are essential for virulence in Salmonella enterica serovar Gallinarum despite evolutionary decay of polyamine biosynthesis genes

      Schroll, C., Christensen, Jens Peter, Christensen, Henrik, Pors, S. E., Thorndahl, L., Jensen, P. R., Olsen, John Elmerdahl & Jelsbak, L., 2014, In: ScienceDirect, Veterinary Microbiology. 170, 1-2, p. 144-150 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    158. Published

      Removal of the phage-shock protein PspB causes reduction of virulence in Salmonella enterica serovar Typhimurium independently of NRAMP1

      Wallrodt, I., Jelsbak, L., Thomsen, Line Elnif, Brix, L., Lemire, S., Gautier, L., Nielsen, Dennis Sandris, Jovanovic, G., Buck, M. & Olsen, John Elmerdahl, 2014, In: Journal of Medical Microbiology. 63, 6, p. 788-795 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    159. Published

      The role of ClpP, RpoS and CsrA in growth and filament formation of Salmonella enterica serovar Typhimurium at low temperature

      Knudsen, G. M., Nielsen, M., Thomsen, Line Elnif, Aabo, S., Rychlik, I. & Olsen, John Elmerdahl, 2014, In: B M C Microbiology. 14, 9 p., 208.

      Research output: Contribution to journal › Journal article › Research › peer-review

    160. Published

      The role of the st313-td gene in virulence of Salmonella Typhimurium ST313

      Herrero Fresno, A., Wallrodt, I., Leekitcharoenphon, P., Olsen, John Elmerdahl, Aarestrup, F. M. & Hendriksen, R. S., 2014, In: PLOS ONE. 9, 1, 11 p., e84566.

      Research output: Contribution to journal › Journal article › Research › peer-review

    161. 2013
    162. Published

      Polyamines are required for virulence and expression of virulence loci in Salmonella Typhimurium

      Jelsbak, L., Thomsen, Line Elnif, Lemire, S. & Olsen, John Elmerdahl, Jul 2013. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

    163. Published

      Identification of redundant metabolic pathways essential for virulence of Salmonella Typhimurium: Abstract book I3S International Symposium Salmonella and Salmonellosis, Saint-Malo, France

      Jelsbak, L., Hartman, H., Jensen, P. R., Poolman, M. & Olsen, John Elmerdahl, 27 May 2013. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    164. Published

      Salmonella source attribution based on microbial subtyping

      Barco, L., Barrucci, F., Olsen, John Elmerdahl & Ricci, A., 2013, In: International Journal of Food Microbiology. 163, 2-3, p. 193-203 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    165. Published

      ClpP deletion causes attenuation of Salmonella Typhimurium virulence through mis-regulation of RpoS and indirect control of CsrA and the SPI genes

      Knudsen, G. M., Olsen, John Elmerdahl, Aabo, S., Barrow, P., Rychlik, I. & Thomsen, Line Elnif, 2013, In: Microbiology. 159, 7, p. 1497-1509 13 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    166. Published

      Colonization resistance and immunological differences in response to an experimental Salmonella infection between two chicken lines selectively bred for high or low concentration of mannonse-binding lectin: SSI13-2018

      Ulrich-Lynge, S. L., Sørensen Dalgaard, T., Norup, L. R., Olsen, John Elmerdahl & Juul-Madsen, H. R., 2013, Scandinavian Journal of Immunology: SSI 2013 Abstract Submission and Innate Immunity. Vol. 77. p. 274-274

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    167. Published

      Comparative study of PCR methods to detect Pasteurella multocida

      Adhikary, S., Bisgaard, M., Foster, G., Kiessling, N., Fahlen, A. R., Olsen, John Elmerdahl & Christensen, Henrik, 2013, In: Berliner und Muenchener Tieraerztliche Wochenschrift. 126, 9/10, p. 415-422 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    168. Published

      Comparison of heat stress responses of immobilized and planktonic Salmonella enterica serovar Typhimurium

      Nielsen, M., Knudsen, G. M., Danino-Appleton, V., Olsen, John Elmerdahl & Thomsen, Line Elnif, 2013, In: Food Microbiology. 33, 2, p. 221-227 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    169. Published

      Factor H binds to the hypervariable region of many Streptococcus pyogenes M proteins but does not promote phagocytosis resistance or acute virulence

      Gustafsson, C. U. M., Lannergård, J., Nilsson, O. R., Kristensen, B. M., Olsen, John Elmerdahl, Harris, C. L., Ufret-Vincenty, R. L., Stålhammar-Carlemalm, M. & Lindahl, C. G., 2013, In: P L o S Pathogens. 9, 4, p. e1003323 17 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    170. Published

      Importance of the producer on retail broiler meat product contamination with Campylobacter spp

      Kudirkiene, E., Buneviciene, J., Serniene, L., Ramonaite, S., Olsen, John Elmerdahl & Malakauskas, M., 2013, In: Journal of the Science of Food and Agriculture. 93, 9, p. 2293-2298 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    171. Published

      Intestinal invasion of Salmonella enterica serovar Typhimurium in the avian host is dose dependent and does not depend on motility and chemotaxis

      Olsen, John Elmerdahl, Hoegh-Andersen, K. H., Rosenkrantz, J. T., Schroll, C., Casadesús, J., Aabo, S. & Christensen, Jens Peter, 2013, In: Veterinary Microbiology. 165, 3-4, p. 373-377 5 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    172. Published

      Non-essential genes form the hubs of genome scale protein function and environmental gene expression networks in Salmonella enterica serovar Typhimurium

      Rosenkrantz, J. T., Aarts, H., Abee, T., Rolfe, M. D., Knudsen, G. M., Nielsen, M., Thomsen, Line Elnif, Zwietering, M. H., Olsen, John Elmerdahl & Pin, C., 2013, In: B M C Microbiology. 13, 16 p., 294.

      Research output: Contribution to journal › Journal article › Research › peer-review

    173. Published

      The putative thiosulfate sulfurtransferases PspE and GlpE contribute to virulence of Salmonella Typhimurium in the mouse model of systemic disease.

      Wallrodt, I., Jelsbak, L., Thorndahl, L., Thomsen, Line Elnif, Lemire, S. & Olsen, John Elmerdahl, 2013, In: P L o S One. 8, 8, 9 p., e70829.

      Research output: Contribution to journal › Journal article › Research › peer-review

    174. Published

      The role of Serpine-1 and Tissue inhibitor of metalloproteinase type-1 in early host responses to Staphylococcus aureus intracutaneous infection of mice

      Harslund, J. L. F., Frees, Dorte, Leifsson, Páll S., Offenberg, H. K., Rømer, M. U. K., Brünner, N. & Olsen, John Elmerdahl, 2013, In: Pathogens and Disease. 68, 3, p. 96-104 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    175. Published

      The role of flagella and chemotaxis genes in host pathogen interaction of the host adapted Salmonella enterica serovar Dublin compared to the broad host range serovar S. Typhimurium

      Olsen, John Elmerdahl, Hoegh-Andersen, K. H., Casadesús, J., Rosenkrantz, J. T., Chadfield, M. S. & Thomsen, Line Elnif, 2013, In: B M C Microbiology. 13, 11 p., 67.

      Research output: Contribution to journal › Journal article › Research › peer-review

    176. 2012
    177. Published

      Molecular-epidemiological investigation of Salmonella enterica serovar Tennessee (S. Tennessee) isolated from long egg production facility

      Jakociune, D., Bisgaard, M., Pedersen, K. & Olsen, John Elmerdahl, 5 Oct 2012. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    178. Published

      Awareness of human health risks associated with the use of antibiotics among livestock keepers and factors that contribute to selection of antibiotic resistance bacteria within livestock in Tanzania

      Katakweba, A. A. S., Mtambo, M. M. A., Olsen, John Elmerdahl & Muhairwa, A. P., Oct 2012, In: Livestock Research for Rural Development. 24, 10

      Research output: Contribution to journal › Journal article › Research › peer-review

    179. Published

      Molecular-epidemiological investigation of Salmonella enterica serovar Tennessee (S. Tennessee) isolated from a suspected case of persistent contamination of a long egg production facility

      Jakociune, D., Bisgaard, M., Pedersen, K. & Olsen, John Elmerdahl, 4 Sep 2012. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    180. Published

      No evidence of biocide resistance in Danish Salmonella isolates from pig slaughterhouses

      Gantzhorn, M. R., Pedersen, K., Olsen, John Elmerdahl & Thomsen, Line Elnif, 4 Sep 2012.

      Research output: Contribution to conference › Poster › Research

    181. Published

      A new real-time PCR method for the identification of Salmonella Dublin

      Persson, S., Jacobsen, T., Olsen, John Elmerdahl, Olsen, K. E. P. & Hansen, F., 2012, In: Journal of Applied Microbiology. 113, 3, p. 615-621 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    182. Published

      A third mode of surface-associated growth: immobilization of Salmonella enterica serovar Typhimurium modulates the RpoS-directed transcriptional programme

      Knudsen, G. M., Nielsen, M., Grassby, T., Danino-Appleton, V., Thomsen, Line Elnif, Colquhoun, I. J., Brocklehurst, T. F., Olsen, John Elmerdahl & Hinton, J. C. D., 2012, In: Environmental Microbiology. 14, 8, p. 1855-1875 21 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    183. Published

      Adaptation of Salmonella Typhimurium to triclosan

      Gantzhorn, M. R., Olsen, John Elmerdahl & Thomsen, Line Elnif, 2012.

      Research output: Contribution to conference › Poster › Research

    184. Published

      Application of the Random Forest method to analyse epidemiological and phenotypic characteristics of Salmonella 4,[5],12:i:- and Salmonella Typhimurium strains

      Barco, L., Mancin, M., Ruffa, M., Saccardin, C., Minorello, C., Zavagnin, P., Lettini, A. A., Olsen, John Elmerdahl & Ricci, A., 2012, In: Zoonoses and Public Health. 59, 7, p. 505-512 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    185. Published

      Awareness of human health risks associated with the use of antibiotics among livestock keepers and factors that contribute to selection of antibiotic resistant bacteria within livestock in Tanzania

      Katakweba, A. A. S., Mtambo, M. M. A., Olsen, John Elmerdahl & Muhairwa, A. P., 2012, In: Livestock Research for Rural Development (Online Edition). 24, 10, 10 p., 170.

      Research output: Contribution to journal › Journal article › Research › peer-review

    186. Published

      Current manure management practices and hygiene aspects of urban and peri-urban livestock farming in Tanzania

      Lupindu, A. M., Ngowi, H. A., Dalsgaard, Anders, Olsen, John Elmerdahl & Msoffe, P. L. M., 2012, In: Livestock Research for Rural Development (Online Edition). 24, 9, 11 p., 167.

      Research output: Contribution to journal › Journal article › Research › peer-review

    187. Published

      Mustelidae are natural hosts of Staphylococcus delphini group A

      Guardabassi, Luca, Schmidt, K. R., Petersen, T. S., Espinosa-Gongora, C., Moodley, Arshnee, Agersø, Y. & Olsen, John Elmerdahl, 2012, In: Veterinary Microbiology. 159, 3-4, p. 351-353 3 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    188. Published

      Persistence of vancomycin-resistant Enterococcus faecium in Danish poultry 15 years after the ban of avoparcin

      Bortolaia, V., Mander, M., Jensen, L. B., Olsen, John Elmerdahl & Guardabassi, Luca, 2012, Book of abtracts: The 4th Central European Symposium on Antimicrobials and Antimicrobial Resistance, CESAR 2012: 23-26 September 2012 - Primošten, Croatia. p. 50 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research › peer-review

    189. Published

      Polyamines are required for virulence in Salmonella enterica serovar Typhimurium

      Jelsbak, L., Thomsen, Line Elnif, Wallrodt, I., Jensen, P. R. & Olsen, John Elmerdahl, 2012, In: PLoS ONE. 7, 4, 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    190. Published

      The binding ability of purified chicken Mannose-Binding Lectin (cMBL) to Salmonella enterica serotype B, C1 and D: AIRG 2012- Scientific program and abstracts, pp 62-62

      Ulrich-Lynge, S. L., Sørensen Dalgaard, T., Norup, L. R., Olsen, John Elmerdahl & Juul-Madsen, H. R., 2012. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    191. Published

      The effect of supplementation on the performance of free range local chickens in Tanzania

      Mutayoba, S. K., Katule, A. K. .., Minga, U., Mtambo, M. M. .. & Olsen, John Elmerdahl, 2012, In: Livestock Research for Rural Development (Online Edition). 24, 5, 13 p., 93.

      Research output: Contribution to journal › Journal article › Research › peer-review

    192. Published

      The importance of motility and chemotaxis for extra-animal survival of Salmonella enterica serovar Typhimuirum and Dublin

      Olsen, John Elmerdahl, Høgh-Andersen, K. H., Casadesús, J. & Thomsen, Line Elnif, 2012, In: Journal of Applied Microbiology. 113, 3, p. 560-568 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    193. Published

      The transcriptional heat shock response of Salmonella Typhimurium shows hysteresis and heated cells show increased resistance to heat and acid stress

      Pin, C., Hansen, T., Munoz-Cuevas, M., de Jonge, R., Rosenkrantz, J. T., Löfström, C., Aarts, H. & Olsen, John Elmerdahl, 2012, In: P L o S One. 7, 12, 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    194. 2011
    195. Published

      Change in attachment of Salmonella typhimurium, Yersinia enterocolitica and Listeria monocytogenes to pork skin and muscle after hot water and lactic acid decontamination

      Morild, R. K., Olsen, John Elmerdahl & Aabo, S., 2011, In: International Journal of Food Microbiology. 145, 1, p. 353-358 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    196. Published

      Demonstration of antibiotic resistance genes strA, blaTEM, tetA, tetC and sul2 in Avibacterium paragallinarum

      Byarugaba, D. K., Minga, U. M., Gwakisa, P. S., Katunguka-Rwakishaya, E., Bisgaard, M., Christensen, Henrik & Olsen, John Elmerdahl, 2011, In: African Journal of Microbiology Research. 5, 22, p. 3624-3627 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    197. Published

      Evidence of broiler meat contamination with post-disinfection strains of Campylobacter jejuni from slaughterhouse

      Kudirkené, E., Buneviciené, J., Brøndsted, Lone, Ingmer, Hanne, Olsen, John Elmerdahl & Malakauskas, M., 2011, In: International Journal of Food Microbiology. 145, Suppl. 1, p. S116-S120 5 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    198. Published

      On the origin and diversity of Newcastle disease virus in Tanzania

      Yongolo, M. G., Christensen, Henrik, Handberg, K., Minga, U. & Olsen, John Elmerdahl, 2011, In: Onderstepoort Journal of Veterinary Research. 78, 1, 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    199. Published

      Seasonal variation in nutritive value of scavenged feed and effect of supplementation on performance of rural birds

      Mutayoba, S. K., Katule, A. K., Minga, U., Mtambo, M. M. & Olsen, John Elmerdahl, 2011, In: Agriculture and Biology Journal of North America. 2, 9, p. 1310-1316 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    200. Published

      Selection of CMY-2 producing Escherichia coli in the faecal flora of dogs treated with cephalexin

      Damborg, Peter Panduro, Gaustad, I. B., Olsen, John Elmerdahl & Guardabassi, Luca, 2011, In: Veterinary Microbiology. 151, 3-4, p. 404-408 5 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    201. Published

      Survival of Salmonella on cuts of beef carcasses subjected to dry aging

      Knudsen, G. M., Sommer, H. M., Sørensen, N. D., Olsen, John Elmerdahl & Aabo, S., 2011, In: Journal of Applied Microbiology. 111, 4, p. 848-854 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    202. Published

      Time-course investigation of infection with a low virulent Pasteurella multocida strain in normal and immune-suppressed 12-week-old free-range chickens

      Mbuthia, P. G., Njagi, L. W., Nyaga, P. N., Bebora, L. C., Minga, U., Christensen, Jens Peter & Olsen, John Elmerdahl, 2011, In: Avian Pathology. 40, 6, p. 629-637 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    203. 2010
    204. Published

      A hitherto not recognized phenotype of spvA in Salmonella

      Frees, Dorte, Gram, L., Holmstrøm, K. & Olsen, John Elmerdahl, 2010, Proceedings: 13S international symposium salmonella and salmonellosis. p. 33-34 2 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    205. Published

      Demonstration of persistent strains of Campylobacter jejuni within broiler farms over a 1-year period in Lithuania

      Kudirkiene, E., Malakauskas, M., Malakauskas, A., Bojesen, Anders Miki & Olsen, John Elmerdahl, 2010, In: Journal of Applied Microbiology. 108, 3, p. 868-877 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    206. Published

      Detection and quantification of Salmonella in pasteurized egg products by real-time PCR

      Jakociune, D., Löfström, C., Hoorfar, J. & Olsen, John Elmerdahl, 2010, Proceedings: 13S international symposium salmonella and salmonellosis. p. 97-98 2 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    207. Published

      Development of a PCR method for verification of Salmonella Dublin

      Hansen, F., Jacobsen, T., Persson, S., Olsen, John Elmerdahl & Mansdal, S., 2010, 22nd International ICFMH Symposium Food Micro 2010. p. 185 1 p. PEC1.67

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    208. Published

      Immobilisation alters the heat shock response of Salmonella typhimurium

      Nielsen, M., Knudsen, G. M., Danino-Appelton, V., Hinton, J. C., Brocklehurst, T., Olsen, John Elmerdahl & Thomsen, Line Elnif, 2010. 1 p.

      Research output: Contribution to conference › Poster › Research

    209. Published

      Impact of immobilisation on virulence of Salmonella typhimurium

      Thomsen, Line Elnif, Nielsen, M., Knudsen, G., Danino-Appleton, V., Hinton, J., Brocklehurst, T. & Olsen, John Elmerdahl, 2010. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    210. Published

      Modelling gene expression in Salmonella using microarray hybridization under conditions relevant to the pork chain

      Pin, C., Hoorfar, J., Olsen, John Elmerdahl, Aarts, H., Nielsen, M. & Knudsen, G., 2010, 22nd International ICFMH Symposium Food Micro 2010: Final Programme et Abstract Book. p. 50 (PSC1.04) 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    211. Published

      Polyamine biosynthesis is essential for macrophage cytotoxicity of Salmonella typhimurium

      Jelsbak, L., Thomsen, Line Elnif & Olsen, John Elmerdahl, 2010. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    212. Published

      Rapid quantification of viable Campylobacter bacteria on chicken carcasses, using real-time PCR and propidium monoazide treatment, as a tool for quantitative risk assessment

      Josefsen, M. H., Löfström, C., Hansen, T. B., Christensen, L. S., Olsen, John Elmerdahl & Hoorfar, J., 2010, In: Applied and Environmental Microbiology. 76, 15, p. 5097-5104 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    213. Published

      Rapid quantification of viable Campylobacter on chicken carcasses by real-time PCR and propidium monoazide as a tool for quantitative risk assessment

      Josefsen, M. H., Löfström, C., Hansen, T. B., Christensen, L. S., Olsen, John Elmerdahl & Hoorfar, J., 2010, 22nd International ICFMH Symposium Food Micro 2010. p. 51 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    214. Published

      The role of phage-shock proteins in Salmonella Typhimurium virulence

      Schmidt, I., Thomsen, Line Elnif, Jelsbak, L. & Olsen, John Elmerdahl, 2010. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    215. Published

      There is more to sessile growth than biofilm and swarming: immobilised growth of Salmonella Typhimurium

      Knudsen, G., Nielsen, M., Grassby, T., Danino-Appleton, V., Thomsen, Line Elnif, Colquhoun, I., Brocklehurst, J., Olsen, John Elmerdahl & Hinton, J., 2010. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    216. 2009
    217. Published

      Characterization of sulphonamide-resistant Escherichia coli using comparison of sul2 gene sequences and multilocus sequence typing

      Trobos Porro, M., Christensen, Henrik, Sunde, M., Nordentoft, S., Agersø, Y., Simonsen, G. S., Hammerum, A. M. & Olsen, John Elmerdahl, 2009, In: Microbiology. 155, p. 831-836 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    218. Published

      Construction of genetic markers for the study of Salmonella typhimurium infection of murine macrophages

      Jelsbak, L. & Olsen, John Elmerdahl, 2009. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    219. Published

      Evolution of the leukotoxin promoter in genus Mannheimia

      Larsen, J., Pedersen, A. G., Davies, R. L., Kuhnert, P., Frey, J., Christensen, Henrik, Bisgaard, M. & Olsen, John Elmerdahl, 2009, In: BMC Evolutionary Biology. 9, 121, 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    220. Published

      Impact of immobilisation on Salmonella Typhimurium virulence

      Nielsen, M., Knudsen, G. M., Danino-Appelton, V., Hinton, J. C. D., Brocklehurst, T., Olsen, John Elmerdahl & Thomsen, Line Elnif, 2009. 1 p.

      Research output: Contribution to conference › Poster › Research

    221. Published

      Impact of immobilisation on Salmonella typhimurium virulence

      Nielsen, M., Knudsen, G. M., Danino-Appleton, V., Hinton, J. C., Brocklehurst, T., Olsen, John Elmerdahl & Thomsen, Line Elnif, 2009. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    222. Published

      Involvement of a peroxiredoxin gene of Listeria Monocytogenes in the survival in the presence of nitrosative stress and in virulence

      Dons, L. E., Mosa, A., Rottenberg, M. E., Kristensson, K., Knoechel, Susanne & Olsen, John Elmerdahl, 2009. 1 p.

      Research output: Contribution to conference › Poster › Research

    223. Published

      Natural transfer of sulphonamide and ampicillin resistance between Escherichia coli residing in the human instestine

      Trobos Porro, M., Lester, C. H., Olsen, John Elmerdahl, Frimodt-Møller, N. & Hammerum, A. M., 2009, In: Journal of Antimicrobial Chemotherapy. 63, 1, p. 80-86 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    224. Published

      Salmonella og Yersinia - bekæmpelsesmuiligheder: 2.2

      Aabo, S., Christensen, H., Christiansen, P., Jensen, Jørgen Dejgård, Morild, R. K., Lawson, G. L., Olsen, John Elmerdahl & Sørensen, A. M. H., 2009, Fremtidens fødevaresikkerhed - nye veje mod sikrere kød i Danmark. Rosenquist, H., Sandøe, P., Tveit, G., Wingstrand, A. & Aabo, S. (eds.). Center for Bioetik og Risikovurdering, p. 70-86 17 p.

      Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Research

    225. Published

      Source tracking of sulphonamide resistance in Escherichia coli using comparison of sul2 gene sequences and MLST typing

      Trobos, M., Hammerum, A. M., Sunde, M., Nordentoft, S., Agersø, Y., Simonsen, G. S., Christensen, Henrik & Olsen, John Elmerdahl, 2009.

      Research output: Contribution to conference › Conference abstract for conference › Research

    226. Published

      The in vitro fitness cost of antimicrobial resistance in Escherichia coli varies with the growth conditions

      Petersen, A. H. H., Aarestrup, F. M. & Olsen, John Elmerdahl, 2009, In: FEMS Microbiology Letters. 299, 1, p. 53-59 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    227. Published

      The immobilised growth of Salmonella enterica serovar Typhimurium in a food matrix modulates the RpoS-directed transcriptional programme

      Knudsen, G. M., Nielsen, M., Grassby, T., Danino-Appelton, V., Thomsen, Line Elnif, Colquhoun, I. J., Brocklehurst, T., Olsen, John Elmerdahl & Hinton, J. C. D., 2009. 1 p.

      Research output: Contribution to conference › Poster › Research

    228. Published

      The immobilised growth of Salmonella enterica serovar Typhimurium in a food matrix modulates the Rpos-directed transcriptional programme

      Knudsen, G. M., Nielsen, M., Grassby, T., Danino-Appleton, V., Thomsen, Line Elnif, Colquhoun, I. J., Brocklehurst, T., Olsen, John Elmerdahl & Hinton, J. C., 2009. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    229. Published

      The role of Spi-6 and a putative type six secretion system in Salmonella serotype Gallinarum virulence

      Olsen, John Elmerdahl, Kristensen, B. M. & Frees, Dorte, 2009, ASM conference on Salmonella: Biology, Pathogenesis & Prevention. p. 50 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    230. 2008
    231. Published

      Pasteurella multocida in scavenging family chickens and ducks: Carrier status, age susceptibility and transmission between species

      Mbuthia, P. G., Njagi, L. W., Nyaga, P. N., Bebora, L. C., Minga, U., Kamundia, J. & Olsen, John Elmerdahl, Feb 2008, In: Avian Pathology. 37, 1, p. 51-57 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    232. Published

      Evaluation of the possibilites for naming of 'Muribacter' gen. nov. including 'Muribacter rattus' sp. nov.

      Christensen, Henrik, Kuhnert, P., Korczak, B. M., Olsen, John Elmerdahl & Bisgaard, M., 2008.

      Research output: Contribution to conference › Conference abstract for conference › Research

    233. Published

      Extended spectrum ß-lactamase producing Escherichia coli and methicillin resistant Staphylococcus aureus in pig production: possible zoonotic implications

      Moodley, Arshnee, Concalves Cavaco, L. M., Olsen, John Elmerdahl & Guardabassi, Luca, 2008, In: Acta Scientiae Veterinariae. 36, Suppl. 1, p. s1-s3 3 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    234. Published

      Gene expression in S. Typhimurium during heat shock and immobilisation

      Nielsen, M., Danino, V., Knudsen, G., Hinton, J., Brocklehurst, T., Olsen, John Elmerdahl & Thomsen, Line Elnif, 2008.

      Research output: Contribution to conference › Poster › Research

    235. Published

      Impact of immobilisation on gene expression in S. Typhimurium/Impact of immobilisation and temperature on virulence in S. Typhimurium

      Nielsen, M., Danino, V., Knudsen, G., Hinton, J., Brocklehurst, T., Olsen, John Elmerdahl & Thomsen, Line Elnif, 2008.

      Research output: Contribution to conference › Poster › Research

    236. Published

      Improved discrimination of Campylobacter jejuni using repetitive element sequence-based PCR typing and comparison with PFGE typing

      Malakauskas, M., Christensen, Henrik, Olsen, John Elmerdahl & Brogren, C., 2008, The 21st International ICFMH Symposium "Evolving Microbial Food Quality and Safety" - Programme and Abstract Book. IUMS/ICFMH, p. 347 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    237. Published

      Investigation of correlation between gene expressions of 162 selected genes and survival and colonization abilities of Salmonella strains in the food chain

      Olsen, John Elmerdahl, Gram, L., Frees, Dorte & Holmstrøm, K., 2008, The 21st International ICFMH Symposium "Evolving Microbial Food Quality and Safety": Programme and Abstract Book. p. 164 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    238. Published

      Persistence of Salmonella Senftenberg in poultry production environments and investigation of its resistance to desiccation

      Pedersen, T. B., Olsen, John Elmerdahl & Bisgaard, M., 2008, In: Avian Pathology. 37, 4, p. 421-427 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    239. Published

      Prevalence of sulphonamide resistance and class 1 integron genes in Escherichia coli isolates obtained from broilers, broiler meat, healthy humans and urinary tract infections in Denmark

      Trobos Porro, M., Jakobsen, L., Olsen, K. E. P., Frimodt-Møller, N., Pedersen, K., Agersø, Y., J. Porsbo, L. & Olsen, John Elmerdahl, 2008, In: International Journal of Antimicrobial Agents. 32, 4, p. 367-369 3 p.

      Research output: Contribution to journal › Comment/debate › Research

    240. Published

      Survival of Salmonella and physiological response to cold storage of beef

      Aabo, S., Knudsen, G. M. & Olsen, John Elmerdahl, 2008, The 21st International ICFMH Symposium "Evolving Microbial Food Quality and Safety". IUMS/ICFMH, p. 161 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    241. Published

      The importance of specific stress proteins in the virulence of Pasteurella multocida VP161

      Rosenkrantz, J. T., Olsen, John Elmerdahl, Pors, S. E., Boyce, J., Harper, M. & Adler, B., 2008, International Pasteurellaceae Society Conference 2008: Abstract Book.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    242. 2007
    243. Published

      Analysis of gene order data supports vertical inheritance of the leukotoxin operon and genome rearrangements in the 5' flanking region in genus Mannheimia

      Larsen, J., Kuhnert, P., Frey, J., Christensen, Henrik, Bisgaard, M. & Olsen, John Elmerdahl, 2007, In: BMC Evolutionary Biology. 7, 184, 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    244. Published

      Comparison of Sul2 resistant gene from Escherichia coli isolated from animals and humans

      Porro, M. T., Hammerum, A. M., Sunde, M., Pedersen, K., Agersø, Y., Christensen, Henrik & Olsen, John Elmerdahl, 2007, Ikke angivet. ASM, 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    245. Published

      Effects of crp deletion in Salmonella enterica serotype Gallinarum

      Rosu, V., Chadfield, M. S., Santona, A., Christensen, Jens Peter, Thomsen, Line Elnif, Rubino, S. & Olsen, John Elmerdahl, 2007, In: Acta Veterinaria Scandinavica (Print Edition). 49, 14, 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    246. Published

      Evidence for vertical inheritance and loss of the leukotoxin operon in genus Mannheimia

      Larsen, J., Pedersen, A. G., Christensen, Henrik, Bisgaard, M., Angen, Ø., Ahrens, P. & Olsen, John Elmerdahl, 2007, In: Journal of Molecular Evolution. 64, 4, p. 423-437 15 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    247. Published

      Fødevaremikrobiologi

      Larsen, M. H., Ingmer, Hanne & Olsen, John Elmerdahl, 2007, LMC årsberetning 2006. Levnedsmiddelcentret, p. 22 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Research

    248. Published

      Hatchability and fertility of indigenous chicken and duck eggs, and some causes of chick and duckling mortality in Kenya

      Mbuthia, P. G., Njagi, L. W., Nyaga, P. N., Bebora, L. C., Mugera, G. M., Minga, U. & Olsen, John Elmerdahl, 2007, In: Kenya Veterinarian. 31, 1, p. 6-11 6 p.

      Research output: Contribution to journal › Journal article › Research

    249. Published

      Investigations of the occurrence of Avibacterium paragallinarum infections in Uganda

      Byarugaba, D. K., Minga, U. M., Gwakisa, P. S., Katunguka-Rwakishaya, E., Bisgaard, M. & Olsen, John Elmerdahl, 2007, In: Avian Diseases. 51, 2, p. 534-539 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    250. Published

      Preliminary Findings on the Carrier Status of Pasteurella multocida in Farmed and Traded Healthy-appearing Scavenging Indigenous Chickens and Ducks in Kenya

      Mbuthia, P. G., Njagi, L. W., Bebora, L. C., Mugera, G. M., Ngatia, T. A., Munyua, W. K., Nyaga, P. N., Minga, U. & Olsen, John Elmerdahl, 2007, In: Kenya Veterinarian. 31, 1, p. 1-5 5 p.

      Research output: Contribution to journal › Journal article › Research

    251. Published

      Prevalence of sulphonamide resistant genes in Escherichia coli isolates obtained from broiler faeces, broiler meat, healthy humans and urinary infections in Denmark

      Porro, M. T., Jacobsen, L., Pedersen, K., Agersø, Y., Olsen, K. E., Porsbo, L. J., Emborg, H., Olsen, John Elmerdahl & Hammerum, A. M., 2007, Prodeedings of 2nd symposium on antimicrobial resistance in animals and the environment. INRA, p. 6

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    252. Published

      Salmonella-infektion - størst risiko ved høj overlevelses- og invasionsevne

      Knudsen, G. M., Aabo, S. & Olsen, John Elmerdahl, 2007, LMC årsberetning 2006. Levnedsmiddelcentret, p. 24 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Report chapter › Communication

    253. Published

      Specific identification of Gallibacterium by a PCR using primers targeting the 16S rRNA and 23S rRNA genes

      Bojesen, Anders Miki, Vazquez, M. E., Robles, F., Gonzalez, C., Soriano, E., Olsen, John Elmerdahl & Christensen, Henrik, 2007, In: Veterinary Microbiology. 123, 1-3, p. 262-268 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    254. Published

      Transfer of sulphonamide resistance from Escherichia coli of animal origin to E. coli of human origin in the human intestine

      Porro, M. T., Lester, C. H., Olsen, John Elmerdahl, Frimodt-Møller, N. & Hammerum, A. M., 2007, Ikke angivet. American Society of Microbiology, p. 137 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    255. Published

      Virulence characterization of Avibacterium paragallinarum isolates from Uganda

      Byarugaba, D., Minga, U. M., Gwakisa, P. S., Katunguka-Rwakishaya, E., Bisgaard, M. & Olsen, John Elmerdahl, 2007, In: Avian Pathology. 36, 1, p. 35-42 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    256. 2006
    257. Published

      The gastrointestinal tract as a port of entry for bacterial infections in poultry

      Christensen, Jens Peter, Chadfield, M. S., Olsen, John Elmerdahl & Bisgaard, M., 20 Dec 2006, Avian Gut Function in Health and Disease. CABI Publishing, Vol. 28. p. 244-258 15 p.

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review

    258. Published

      In vitro transfer of sulphonamide and gentamicin resistance from E. coli of animal origin to E. coli of human origin

      Porro, M. T., Olsen, John Elmerdahl, Jakobsen, L. & Hammerum, A. M., 2006. 1 p.

      Research output: Contribution to conference › Poster › Research

    259. Published

      Differences in resistance to Salmonella enterica serovar Gallinarum infection among indigenous local chicken ecotypes in Tanzania

      Msoffe, P. L. M., Minga, U. M., Mtambo, M. M. A., Gwakisa, P. S. & Olsen, John Elmerdahl, 2006, In: Avian Pathology. 35, 4, p. 270-276 7 p.

      Research output: Contribution to journal › Journal article › Research

    260. Published

      Diversity and evolution of blaZ from Staphylococcus aureus and coagulase-negative staphylococci

      Olsen, John Elmerdahl, Christensen, Henrik & Aarestrup, F. M., 2006, In: Journal of Antimicrobial Chemotherapy. 57, 3, p. 450-460 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    261. Published

      Fitness cost of antimicrobial resistance associated with chromosomal mutations and plasmid-borne resistance genes in Escherichia coli: in vitro and in vivo studies

      Petersen, A., Aarestrup, F. M., Bisgaard, M. & Olsen, John Elmerdahl, 2006, Clinical Microbiology and Infection. Blackwell Publishing, Vol. 12, supplement 4. 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    262. Published

      Isolation of Campylobacter spp. from a pig slaughterhouse and analysis of cross-contamination

      Malakauskas, M., Jørgensen, K., Nielsen, E. M., Ojeniyi, B. & Olsen, John Elmerdahl, 2006, In: International Journal of Food Microbiology. 108, 3, p. 295-300 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    263. Published

      Occurence, isolation and characterization of Avibacterium paragallinarum from poultry in Uganda

      Byarugaba, D. K., Minga, U. M., Gwakisa, P. S., Katunguka, E. R., Bisgaard, M. & Olsen, John Elmerdahl, 2006, Ikke angivet. The International Society for Veterinary Epidemiology and Economics, p. 381-384 4 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    264. Published

      Occurrence of haemolytic Mannheimia spp. in apparently healthy sheep in Norway

      Poulsen, L. L., Reinert, T. M., Sand, R. L., Bisgaard, M., Christensen, Henrik, Olsen, John Elmerdahl, Stuen, S. & Bojesen, Anders Miki, 2006, In: Acta Veterinaria Scandinavica (Print Edition). 48, 19, 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    265. Published

      Salmonella infections: 3

      Mølbak, K., Olsen, John Elmerdahl & Wegener, H. C., 2006, Foodborne infections and intoxications. Riemann, H. P. & Cliver, D. O. (eds.). Elsevier, p. 57-136 80 p.

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research

    266. Published

      Survival of Salmonella serovars on beef carcasses and molecular mechanisms to survive low temperature stress and desiccation

      Knudsen, G. M., Thomsen, Line Elnif, Aabo, S. & Olsen, John Elmerdahl, 2006, I3S International Symposium Salmonella and Salmonellosis Proceedings. ISPAIA Zoopole, p. 353-356 4 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    267. Published

      The response regulator ResD modulates virulence gene expression in response to carbohydrates in Listeria monocytogenes

      Larsen, M. H., Kallipolitis, B. H., Christiansen, J. K., Olsen, John Elmerdahl & Ingmer, Hanne, 2006, In: Molecular Microbiology. 61, 6, p. 1622–1635 14 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    268. Published

      Training risk assessment in non-human antimicrobials usage (TRAINAU) in Denmark

      Vieira, A. R. P., Emborg, H., Wong, D. L. F., Jensen, L. B., Aarestrup, F. M., Wegener, H. C., Dalsgaard, Anders, Olsen, John Elmerdahl, Ersbøll, A. K., Houe, Hans, Guardabassi, Luca, Hammerum, A. M., Fritmodt-Møller, N. & Sørensen, B. H., 2006, Proceedings. The International Society for Veterinary Epidemiology and Economics, 3 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    269. Published

      Transmission routes of Salmonella Typhimurium DT 104 between 14 cattle and pig herds in Denmark demonstrated by molecular fingerprinting

      Langvad, B., Skov, M. N., Rattenborg, E., Olsen, John Elmerdahl & Baggesen, D. L., 2006, In: Journal of Applied Microbiology. 101, 4, p. 883-890 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    270. Published

      Vertical transmission of a fluoroquinolone-resistant Escherichia coli within an intergrated broiler operation

      Petersen, A., Christensen, Jens Peter, Kuhnert, P., Bisgaard, M. & Olsen, John Elmerdahl, 2006, In: Veterinary Microbiology. 116, 1-3, p. 120-128 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    271. Published

      [Pasteurella] caballi infection not limited to horses - a closer look at taxon 42 of Bisgaard

      Christensen, Henrik, Hommez, J., Olsen, John Elmerdahl & Bisgaard, M., 2006, In: Letters in Applied Microbiology. 43, 4, p. 424-429 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    272. 2005
    273. Published

      Salmonella isolates with different behavior in adhesion to surfaces studied by DNA micro array assisted analysis

      Holmstrøm, K., Olsen, K. N., Meldgaard, H., Bagge-Ravn, D., Frees, Dorte, Lauritsen, D., Gram, L. & Olsen, John Elmerdahl, 2005. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    274. Published

      A study on effectiveness of seven disinfectants against possible bacteria contaminants of coops and premises inhabited by indigenous chickens and ducks

      Njagi, L. W., Mbuthia, P. G., Bebora, L. C., Nyaga, P. N., Minga, U. & Olsen, John Elmerdahl, 2005, In: Kenya Veterinarian. 29, p. 113-118 4 p.

      Research output: Contribution to journal › Journal article › Research

    275. Published

      Characterization of sucrose-negative Pasteurella multocida variants, including isolates from large-cat bite wounds

      Christensen, Henrik, Bisgaard, M., Angen, Ø., Frederiksen, W. & Olsen, John Elmerdahl, 2005, In: Journal of Clinical Microbiology. 43, 1, p. 259-270 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    276. Published

      Classification and description of new taxa of Pasteurellaceae associated with Maridae and proposal of new genus Muribacterium gen. nov: B-1314

      Christensen, Henrik, Bisgaard, M., Fink, M. & Olsen, John Elmerdahl, 2005, Abstracts of the 11. international congress of bacteriology and applied microbiology. IUMS, p. 70 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    277. Published

      Comparision between flourescent In situ hybridization (fish) and culture method in the detection of Pasteurella multocida in organs of indigenous birds

      Mbuthia, P. G., Njagi, L. W., Nyaga, P. N., Bebora, L. C., Mugera, G. M., Kamundia, J., Minga, U. & Olsen, John Elmerdahl, 2005, In: Kenya Veterinarian. 29, p. 53-56 4 p.

      Research output: Contribution to journal › Journal article › Research

    278. Published

      Comparision of the Carrier Status of Pasterurella multocida between Farm and Live Market Indigenous Birds

      Mbuthia, P. G., Njagi, L. W., Nyaga, P. N., Bebora, L. C., Mugera, G. M., Kamundia, J., Minga, U. M. & Olsen, John Elmerdahl, 2005, In: Kenya Veterinarian. 29, p. 45-47 3 p.

      Research output: Contribution to journal › Journal article › Research

    279. Published

      Effects of nitic oxide in 5-hydroxytryptamine-, cholera toxin-, enterotoxigenic Escherichia coli- and Salmonella Typhimurium-induced secretion in the porcine small intestine

      Grøndahl, M. L., Unmack, M. A., Ragnarsdóttir, H. B., Hansen, M. B., Olsen, John Elmerdahl & Skadhauge, E., 2005, In: Comparative Biochemistry and Physiology. 141, p. 476-484 9 p.

      Research output: Contribution to journal › Journal article › Research

    280. Published

      Emended description of porcine [Pasteurella] aerogenes, [Pasteurella] mairii and [Actinobacillus] rossii

      Christensen, Henrik, Kuhnert, P., Bisgaard, M., Mutters, R., Dziva, F. & Olsen, John Elmerdahl, 2005, In: International Journal of Systematic and Evolutionary Microbiology. 55, p. 209-223 17 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    281. Published

      Emerging clones of Salmonella

      Olsen, John Elmerdahl, 2005, Abstracts. Society for General Microbiology, p. 7 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    282. Published

      Evolution of Leukotoxin Regulatory regions in Genus Mannheimia by Interspecies Comparisons

      Larsen, J., Pedersen, A. G., de Lichtenberg, U., Christensen, Henrik, Olsen, John Elmerdahl, Kuhnert, P. & Frey, J., 2005.

      Research output: Contribution to conference › Poster › Research

    283. Published

      Evolution of leukotoxin regulatory regions in genus Mannheimia

      Larsen, J., Pedersen, A. G., Christensen, Henrik, Olsen, John Elmerdahl, Davies, R. L., Kubnert, P. & Frey, J., 2005. 1 p.

      Research output: Contribution to conference › Poster › Research

    284. Published

      Evolution of the Leukotoxin Operon in Genus Mannheimia

      Larsen, J., Pedersen, A. G., Christensen, Henrik, Bisgaard, M., Angen, Ø., Ahrens, P. & Olsen, John Elmerdahl, 2005. 2 p.

      Research output: Contribution to conference › Poster › Research

    285. Published

      Identification and characterization of pasteurella multocida stress genes

      Ottesen, J. R., Olsen, John Elmerdahl, Adler, B. & Boyce, J., 2005. 2 p.

      Research output: Contribution to conference › Poster › Research

    286. Published

      Indigenous ducks are better reservoirs of P. Multocida than indigenous chickens

      Mbuthia, P. G., Njagi, L. W., Nyaga, P. N., Bebora, L. C., Mugera, G. M., Minga, U. M. & Olsen, John Elmerdahl, 2005, In: Kenya Veterinarian. 29, p. 104-106 3 p.

      Research output: Contribution to journal › Journal article › Research

    287. Published

      Navngivning af sygdomsfremkaldende bakterier

      Christensen, Henrik, Bisgaard, M., Christensen, Jens Peter & Olsen, John Elmerdahl, 2005, In: Naturens Verden. 2, p. 32-39 8 p.

      Research output: Contribution to journal › Journal article › Communication

    288. Published

      Salmonella Typhimurium infection in the porcine intestine: evidence for caspase-3-dependent and -independent programmed cell death

      Schauser, K., Olsen, John Elmerdahl & Larsson, L., 2005, In: Histochemical Cell Biology. 123, 1, p. 43-50 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    289. Published

      Studies of zoonotic Salmonellae: taxonomy, detection, typing and pathogenesis

      Olsen, John Elmerdahl, 2005, Copenhagen: Center for Skov, Landskab og Planlægning/Københavns Universitet. 146 p.

      Research output: Book/Report › Doctoral thesis › Research

    290. Published

      Survival of Escherichia coli and Salmonella typhimurium in slurry applied to clay soil on a Danish swine farm

      Boes, J., Alban, L., Bagger, J., Møgelmose, V., Baggesen, D. L. & Olsen, John Elmerdahl, 2005, In: Preventive Veterinary Medicine. 69, 3-4, p. 213-228 16 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    291. Published

      Taxonomy of Pasteurellaceae: an update B18

      Christensen, Henrik, Kubnert, P., Olsen, John Elmerdahl & Bisgaard, M., 2005, Pasteurellaceae 2005. American Society of Microbiology, p. 1 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    292. Published

      The current state of Pasteurellaceae systematics

      Olsen, John Elmerdahl, Bisgaard, M., Kubnert, P. & Christensen, Henrik, 2005, Pasteurellaceae 2005. American Society of Microbiology, p. 14 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    293. Published

      Vertical transmission of a fluroquinolone-resistant Escherichia coli clone within an integrated broiler operation

      Petersen, A., Christensen, Jens Peter, Bisgaard, M. & Olsen, John Elmerdahl, 2005, Final program & abstract book. p. 309 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

    294. 2004
    295. Published

      Productivity and reproductive performance of the freerange local domestic fowl ecotypes in Tanzania

      Msoffe, P. L. M., Mtambo, M. M. A., Minga, U. M., Olsen, John Elmerdahl, Juul-Madsen, H. R., Gwakisa, P. S., Mutayoba, S. K. & Katule, A. M., Sep 2004, In: Livestock Research for Rural Development. 16, 9

      Research output: Contribution to journal › Journal article › Research › peer-review

    296. Published

      Characterization of DegU: a response regulator in Listeria monocytogenes, involved in regulation of motility and contributes to virulence

      Knudsen, G. M., Olsen, John Elmerdahl & Dons, L. E., 2004, In: FEMS Microbiology Letters. 240, p. 171-179 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    297. Published

      Comparative phylogenies of the housekeeping genes atpD, infB and rpoB and the 16S rRNA gene within the Pasteurellaceae

      Christensen, Henrik, Kuhnert, P., Olsen, John Elmerdahl & Bisgaard, M., 2004, In: International Journal of Systematic and Evolutionary Microbiology. 54, p. 1601-1609 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    298. Published

      Differences in the carriage and the ability to utilize the serotype associated virulence plasmid in strains of Salmonella enterica serotype Typhimurium investigated by use of a self-transferable virulence plasmid, pOG669

      Olsen, John Elmerdahl, Brown, D. J., Thomsen, Line Elnif, Platt, D. J. & Chadfield, M. S., 2004, In: Microbial Pathogenesis. 36, 6, p. 337-347 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    299. Published

      Differentiation of Pasteurella multocida isolates from cases of atrophic rhinitis in pigs from Zimbabwe by RAPD and ribotyping

      Dziva, F., Christensen, Henrik, Leengoed, L. A. M. G. V., Mohan, K. & Olsen, John Elmerdahl, 2004, In: Veterinary Microbiology. (2004): Vol. 102, 1-2, p. 117-122 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    300. Published

      Immunocytochemical studies of Salmonella Typhimurium invasion of porcine jejunal epithelial cells

      Schauser, K., Olsen, John Elmerdahl & Larsson, L., 2004, In: Journal of Medical Microbiology. 53, 7, p. 691-695 5 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    301. Published

      Influences of temperature, salinity and starvation on the motility and chemotactic response of Vibrio anguillarum

      Larsen, M. H., Blackburn, N., Larsen, J. L. & Olsen, John Elmerdahl, 2004, In: Microbiology. 150, p. 1283-1290 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    302. Published

      New indolicidin analogues with potent antibacterial activity

      Neerup, T. S. R., Doisy, X., Ifrah, D., Olsen, John Elmerdahl & Hansen, Paul Robert, 2004, In: Chemical Biology and Drug Design (Print). 64, 5, p. 171-185 15 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    303. Published

      Occurrence and persistence of vancomycin resistant enterococci (VRE) in danish broiler production after the avoparcin ban

      Heuer, O. E., Pedersen, K., Andersen, J. S., Jensen, L. B., Olsen, John Elmerdahl & Madsen, M., 2004, In: DIAS report. 57, p. 35-41 7 p.

      Research output: Contribution to journal › Journal article › Research

    304. Published

      Organic Rearing Enhances Disease and Pathology Due to Interactions of Thrichuris and the Microbial Microflora in Young Swine

      Mansfield, L., Steenhard, N. R., Roepstorff, A. K., Kringel, H., Mejer, Helena, Olsen, John Elmerdahl, Jørgensen, K., Møller-Nielsen, E., Murrell, K. & Thamsborg, Stig Milan, 2004.

      Research output: Contribution to conference › Conference abstract for conference › Research

    305. Published

      Productivity and reproductive performance of the free-range local domestic fowl ecotypes in Tanzania

      Msoffe, P. L. M., Mtambo, M. M. A., Minga, U. M., Olsen, John Elmerdahl, Juul-Madsen, H. R., Gwakisa, P. S., Mutayoba, S. K. & Katule, A. M., 2004, In: Livestock Research for Rural Development. 16, 9, p. s. x-x 13 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    306. Published

      Reclassification of Bisgaard taxon 33, with proposal of Volucribacter psittacicida gen.nov., sp. nov. and Volucribacter amazonae sp. nov. as new members of the Pasteurellaceae

      Christensen, Henrik, Bisgaard, M., Aalbæk, Bent & Olsen, John Elmerdahl, 2004, In: International Journal of Systematic and Evolutionary Microbiology. 54, p. 813-818 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    307. Published

      Revised description and classification of atypical isolates of Pasteurella multocida from bovine lungs based on genotypic characterization to include variants previously classified as biovar 2 of Pasteurella canis and Pasteurella avium

      Christensen, Henrik, Angen, Ø., Olsen, John Elmerdahl & Bisgaard, M., 2004, In: Microbiology. 150, p. 1757-1767 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    308. Published

      Role of flagellin and the fwo-component CheA/CheY system of Listeria monocytogenes in host cell invasion and virulence

      Dons, L. E., Eriksson, E., Jin, Y., Rottenberg, M. E., Kristensson, K., Larsen, C. N., Bresciani, J. & Olsen, John Elmerdahl, 2004, In: Infection and Immunity. 72, 6, p. 3237-3244 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    309. Published

      Role of flagellin and the two-component cheA/cheY system of Listeria monocytogenes in host cell invasion and virulence

      Dons, L., Eriksson, E., Jin, Y., Rottenberg, M. E., Kristensson, K., Larsen, C. N., Bresciani, J. & Olsen, John Elmerdahl, 2004, In: Infection and Immunity. 72, 6, p. 3237-3244 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    310. 2003
    311. Published

      Marketing of free range local chickens in Morogoro and Kilosa urban markets, Tanzania

      Mlozi, M. R. S., Kakengi, A. V. M., Minga, U. M., Mtambo, A. M. & Olsen, John Elmerdahl, Feb 2003, In: Livestock Research for Rural Development. 15, 2

      Research output: Contribution to journal › Journal article › Research › peer-review

    312. Published

      Genetic relationship among avian isolates classified as Pasteurella haemolytica. 'Actinobacillus salpingitidis' or Pasteurella anatis with proposal of Gallibacterium anatis gen. nov., comb. nov. and description of additional genomospecies with Gallibacterium gen. nov

      Christensen, Henrik, Bisgaard, M., Bojesen, Anders Miki, Mutters, R. & Olsen, John Elmerdahl, Jan 2003, In: International Journal of Systematic and Evolutionary Microbiology. 53, 1, p. 275-287 13 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    313. Published

      A manual of basic tools in bioinformatics

      Christensen, Henrik & Olsen, John Elmerdahl, 2003. 34 p.

      Research output: Contribution to conference › Paper › Research

    314. Published

      A manual of basic tools in bioinformatics

      Christensen, Henrik & Olsen, John Elmerdahl, 2003, 35 p.

      Research output: Book/Report › Compendium/lecture notes › Education

    315. Published

      Association between phage types and antimicrobial resistance bovine Staphylococcus aureus from 10 countries

      Vintov, J., Aarestrup, F. M., Zinn, C. E. & Olsen, John Elmerdahl, 2003, In: Veterinary Microbiology. 95, p. 133 14 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    316. Published

      Bacterial resistance to antimicrocials in a practical perspective

      Olsen, John Elmerdahl & Mrenoski, S., 2003. 7 p.

      Research output: Contribution to conference › Paper › Research

    317. Published

      Biology of salmonella enterica serovar gallinarum host-specificiti in the avian host.

      Olsen, John Elmerdahl, Chadfield, M. S., Aabo, S., Brown, D. J. & Christensen, Jens Peter, 2003, ASM Conferences. American Society of Microbiology, p. 22 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    318. Published

      Comparison of intestinal invasion and macrophage response of Salmonella Gallinarum and other host adapted Salmonella enterica serovars in the avian host

      Chadfield, M. S., Brown, D. J., Aabo, S., Christensen, Jens Peter & Olsen, John Elmerdahl, 2003, In: Veterinary Microbiology. 92, 2003, p. 49-64 15 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    319. Published

      Cross-contamination with Salmonella on a broiler slaughterhouse line demonstrated by use of epidemiological markers

      Olsen, John Elmerdahl, Brown, D. J., Madsen, M. & Bisgaard, M., 2003, In: Journal of Applied Microbiology. 94, 5, p. 826-835 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    320. Published

      Cross-sontamination with Salmonella on a broiler slaughter house line demonstrated by use of epidemiological markers. Journ. of Applied Microbiology 2003, 94, 826-835.

      Olsen, John Elmerdahl, Brown, D. J., Madsen, M. & Bisgaard, M., 2003, In: Journ. of Applied Microbiology. 94, p. 826-835 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    321. Published

      Detection and diagnosis of infective bovine mastitis

      Mrenoski, S. & Olsen, John Elmerdahl, 2003. 10 p.

      Research output: Contribution to conference › Paper › Research

    322. Published

      Detection of Gallibacterium spp. in Chickens by Fluorescent 16S rRNA In Situ Hybridization

      Bojesen, Anders Miki, Christensen, Henrik, Nielsen, O. L., Olsen, John Elmerdahl & Bisgaard, M., 2003, In: Journal of Clinical Microbiology. VOl 41, No. 11, 11, p. 5167-5172 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    323. Published

      Detection of gallibacterium spp. in chickens by fluorescent 16s in situ hybridizatuib

      Bojesen, Anders Miki, Christensen, Henrik, Nielsen, O. L., Olsen, John Elmerdahl & Bisgaard, M., 2003. 1 p.

      Research output: Contribution to conference › Paper › Research

    324. Published

      Genetic Diversity of Gallibacterium anatis Isolates from Different Chicken Flocks

      Bojesen, Anders Miki, Thorpdahl, M., Christensen, Henrik & Olsen, John Elmerdahl, 2003, In: Journal of Clinical Microbiology. June, p. 2737-2740, 6, p. 2737-2740 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    325. Published

      Genetic relationships among avian isolates classified as Pasteurella haemolytica, "Actinobacillus salpingitidis" or Pasteurella anatis with proposal of Gallibacterium anatis gen. nov., comb. nov. and discription of additional genomospecies within Gallibacterium gen. nov.

      Christensen, Henrik, Bisgaard, M., Bojesen, Anders Miki, Mutters, R. ;. & Olsen, John Elmerdahl, 2003, In: Int. Journal of Systemtic and Evolutionary Microbiology. (2003) 53, p. 275-287 13 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    326. Published

      Link between stress adaptation and virulence of Salmonella Dublin and S. Typhimurium.

      Thomsen, Line Elnif, Olsen, John Elmerdahl, Chadfield, M. S. & Ingmer, Hanne, 2003, Meeting of WG of COST920. 1 ed. Veterinary Medical Research Institute of the Hungarian Academy of Sciences, p. 22 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    327. Published

      Marketing of free range local chickens in Morogora and Kilosa urban markets, Tanzania.

      Mlozi, M. R. S., Kakengi, A. V. M., Minga, U. M., mtambo, A. M. & Olsen, John Elmerdahl, 2003, In: Livestock Research for Rural Development. (2) 2003, p. 1 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    328. Published

      Marketingof fress range local chickens in Morogora and Kilosa urban markets, Taqnzania

      Mlozi, M. R. S., Kakengi, U. M., Minga, A. M., Mtambo, A. M. & Olsen, John Elmerdahl, 2003, 15 ed. 12 p.

      Research output: Book/Report › Ph.D. thesis › Research

    329. Published

      Of Hemophilus paragallinarum,Hemophilus somnus, Mannheimia (Pasteurella hemolytica, MannHeimia spp., Pasteurella trehalosi, and Pasteurella multocida.

      Larsen, J., Christensen, Henrik, Bisgaard, M. & Olsen, John Elmerdahl, 2003, Methods in Molecular Biology. p. 216. 27 p.

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research

    330. Published

      Phages types and antimicrobial resistande among Danish bovine Staphylococcus aureua isolates since the 1950s

      Vintov, J., Aarestrup, F. M., Zinn, C. E. & Olsen, John Elmerdahl, 2003, In: Veterinary Microbiology. 97, p. 63 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    331. Published

      Phylogenetic analysis by 16S rDNA gene sequence comparison of avian taxa of Bisgaard and characterization and description of two new taxa of Pasteurellaceae

      Christensen, Henrik, Foster, G., Christensen, Jens Peter, Pennycott, T., Olsen, John Elmerdahl & Bisgaard, M., 2003, In: Journal of Applied Microbiology. 95, 2, p. 354-363 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    332. Published

      Reduced amounts of LPS affect both stress tolerance and virulence of Salmonella enterica serovar Dublin.

      Thomsen, Line Elnif, Chadfield, M. S., Bispham, J. ,., Wallis, T. S. ,., Olsen, John Elmerdahl & Ingmer, Hanne, 2003, In: FEMS Microbiology Letters. 228, 2, p. 225-231 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    333. Published

      Salmonella typhimurium invades multiple epithelial cell types in pig jejunum

      Schauser, K., Olsen, John Elmerdahl & Larsson, L., 2003, ASM Conferences. American Society of Microbiology, p. 89 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    334. Published

      The role of flagella and shemotaxis on virulence of salmonella enterica serotypes typhimurium and Dublin

      Chadfield, M. S., Høegh-Andersen, K. H., Aabo, S., Christensen, Jens Peter & Olsen, John Elmerdahl, 2003. 1 p.

      Research output: Contribution to conference › Paper › Research

    335. 2002
    336. Published

      Characterisation of attenuated crp mutants of Salmonella enterica biotype gallinarum

      Chadfield, M. S., Rosu, V., Santona, A., Rubino, S. & Olsen, John Elmerdahl, 2002. 2 p.

      Research output: Contribution to conference › Paper › Research

    337. Published

      ClpP is involved in the stress response and degradation of misfolded proteins in Salmonella enterica serovar typhimurium

      Thomsen, Line Elnif, Olsen, John Elmerdahl, Foster, J. W. & Ingmer, Hanne, 2002, In: Microbiology. 148, p. 2727-2733 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    338. Published

      Comparative Pathogenesis of Experimental Infections with Salmonella gallinarum in Local and Commericial Chickens. Propical Animal Health and Production, 34

      Mdegela, R. H., Msoffe, P. L. M., Waihenya, R. W., Kasanga, J. C., Mtambo, M. M. A., Minga, U. M. & Olsen, John Elmerdahl, 2002, In: Propical Animal Health and Production. 34, p. 195-204 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    339. Published

      Comparative pathogenesis of experimental infections with Salmonella gallinarum in local and commercial chickens

      Mdegela, R. H., Msoffe, P. L. M., Waihenya, R. W., Kasanga, J. C., Mtambo, M. M. A., Minga, U. M. & Olsen, John Elmerdahl, 2002, In: Tropical Animal Health and Production. 34, 3, p. 195-204 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    340. Published

      Detection of gallibacterium (Pasteurella anatis, [Actinobacillus] salpingtidis and [P.] haemolytica-like organisms) in chickens by fluorescent 16S rRNA in situ hybridization

      Bojesen, Anders Miki, Christensen, Henrik, Bisgaard, M., Nielsen, O. L. & Olsen, John Elmerdahl, 2002, Abstract. 89 ed. p. 77 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    341. Published

      Differences in the ability of Salmonella typhimurium strains to utilize the serotype associated virulence plasmid

      Olsen, John Elmerdahl, Thomsen, Line Elnif, Brown, D. J. & Chadfield, M. S., 2002. 2 p.

      Research output: Contribution to conference › Paper › Research

    342. Published

      Distribution of the leukotoxin gene (1ktA) in Mannheimia species isolated from different animal hosts

      Larsen, J., Christensen, Henrik, Bisgaard, M. & Olsen, John Elmerdahl, 2002, Abstract. 91 ed. p. 77-78 2 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    343. Published

      Final classification of Bisgaard taxon 9 as Actinobacillus arthritidis sp. nov. and recognition of a novel genomospecies for equine strains of Actinobacillus lignieresii

      Christensen, Henrik, Bisgaard, M., Angen, Ø. & Olsen, John Elmerdahl, 2002, In: International Journal of Systematic and Evolutionary Microbiology. 52, p. 1239-1246 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    344. Published

      Genomic diversity of Gallibacterium anatis in chicken flocks representing different production systems

      Bojesen, Anders Miki, Thorpdahl, M., Christensen, Henrik, Olsen, John Elmerdahl & Bisgaard, M., 2002, Abstract. 90 ed. p. 77 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    345. Published

      Genotypic heterogeneity of Pasteurella gallinarum as shown by ribotyping and 16S rRNA sequencing

      Christensen, Henrik, Dziva, F., Olsen, John Elmerdahl & Bisgaard, M., 2002, In: Avian Pathology. 31, p. 603-610 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    346. Published

      Genotypical homogeneity among phenotypic variants of Pasteurella multocida, biovars 2 or P. canis and P. avium and isolates misclassified as P. anatis

      Christensen, Henrik, Olsen, John Elmerdahl & Bisgaard, M., 2002, Abstract. 19 ed. p. 29 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    347. Published

      Nutrient status of crop contents of rural scavenging local chickens in Tanzania

      Mwalusanya, N. A., Katule, A. M., Mutayoba, S. K., Minga, U. M., Mtambo, M. M. A. & Olsen, John Elmerdahl, 2002, In: British Poultry Science. 43, 1, p. 64-69 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    348. Published

      PCR detection of [haemophilus] paragallinarum, [H] somnus, Mannheimia (Pasteurella) haemolytica, Mannheimia spp., [P.] trehalosi, and Pasteurella multocida

      Christensen, Henrik, Bisgaard, M., Larsen, J. & Olsen, John Elmerdahl, 2002, PCR detection of microbial pathogens : methods and protocols. Sachse, K. & Frey, J. (eds.). Humana Press, p. 257-274 18 p.

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research

    349. Published

      Prevalence and clonal diversity of Actinobacillus salpingtidis/Pasteurella haemolytica-like bacteria in chickens from different production systems

      Bojesen, Anders Miki, Thorpdahl, M., Christensen, Henrik, Olsen, John Elmerdahl & Bisgaard, M., 2002. 1 p.

      Research output: Contribution to conference › Paper › Research

    350. Published

      Productivity and natural disease resistance potential of free-ranging local chicken ecotypes in Tanzania

      Msoffe, P. L. M., Mtambo, M. M. A., Minga, U. M., Gwakisa, P. S., Mdegela, R. H. & Olsen, John Elmerdahl, 2002, In: Livestock Research for Rural Development. 14, 3, 12 p.

      Research output: Contribution to journal › Journal article › Research

    351. Published

      Quantitative comparison of intestinal invasion of zoonotic serotypes of Salmonella enterica in poultry

      Aabo, S., Christensen, Jens Peter, Chadfield, M. S., Carstensen, B., Olsen, John Elmerdahl & Bisgaard, M., 2002, In: Avian Pathology. 31, 1, p. 41-47 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    352. Published

      Quantitative investigations of in vivo invasion of Pasteurella multocida using a chicken intestinal loop model

      Christensen, Jens Peter, Bojesen, Anders Miki, Jensen, T. K., Bisgaard, M., Nielsen, O. L. & Olsen, John Elmerdahl, 2002, Abstract. 21 ed. p. 30 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    353. Published

      Reclassification of Bisgaard taxon 33 with proposal of Avibacterium amazonae gen. nov., sp. nov. as a new member of pasteurellaceae

      Christensen, Henrik, Aalbæk, Bent, Bisgaard, M. & Olsen, John Elmerdahl, 2002, Abstract. 16 ed. p. 29 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    354. Published

      Reclassification of equine isolates previously reported as Actinobacillus equuli, variants of A. equuli, Actinobacillus suis or Bisgaard taxon 11 and proposal of A. equuli subsp. equuli subsp. nov. and A. equuli subsp. haemolyticus subsp. nov.

      Christensen, Henrik, Bisgaard, M. & Olsen, John Elmerdahl, 2002, In: International Journal of Systematic and Evolutionary Microbiology. 52, p. 1569-1576 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    355. Published

      Revised phylogeny of pasteurellaceae by 16S rRNA and house-keeping gene sequence analysis and impact on host association

      Christensen, H. M., Bisgaard, M. & Olsen, John Elmerdahl, 2002, Abstract. 17 ed. p. 28 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    356. Published

      Revised phylogeny of pasteurellaceae by 16S rRNA and house-keeping gene sequence comparisons

      Christensen, Henrik, Bisgaard, M. & Olsen, John Elmerdahl, 2002.

      Research output: Contribution to conference › Paper › Research

    357. Published

      Taxonomic changes within Actinobacillus sensu stricto

      Bisgaard, M., Christensen, Henrik & Olsen, John Elmerdahl, 2002, Abstract. 18 ed. p. 29 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    358. 2001
    359. Published

      Bakteriel resistens overfor desinfektionsmidler

      Aarestrup, F. M., Hasman, H. & Olsen, John Elmerdahl, 2001, In: Dansk Veterinærtidsskrift. 84, 21, p. 6-13 8 p.

      Research output: Contribution to journal › Journal article › Research

    360. Published

      Chemotaxis of Vibrio anguillarum to fish mucus: role of the origin of the fish mucus, the fish species and the serogroup of the pathogen

      Larsen, M. H., Larsen, J. L. & Olsen, John Elmerdahl, 2001, In: FEMS Microbiology Ecology. 38, p. 77-80 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    361. Published

      Comparative investigations on the invasion of Salmonella serotypes in a chicken intestinal loop assay and cell culture assays

      Christensen, Jens Peter, Aabo, S., Chadfield, M. S., Cartensen, N., Olsen, John Elmerdahl & Bisgaard, M., 2001. 1 p.

      Research output: Contribution to conference › Paper › Research

    362. Published

      Determination of the oxidative burst chemiluminescent response of avian and murine primary macrophages versus corresponding cell lines in relation to stimulation with Salmonella serotypes

      Chadfield, M. S. & Olsen, John Elmerdahl, 2001, In: Veterinary Immunology and Immunopathology. 80, p. 289-308 20 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    363. Published

      Effects of indomethacin on Salmonella Typhimurium- and cholera toxin-induced fluid accumulation in the porcine small intestine

      Unmack, M. A., Berner Hansen, M., Grøndahl, M. L., Olsen, John Elmerdahl, Christensen, P. & Skadhauge, E., 2001, In: Transboundary and Emerging Diseases. 48, p. 153-163 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    364. Published

      Genetic diversity of Pasteurella multocida fowl cholera isolates as demonstrated by ribotyping and 16S rRNA and partial atpD sequence comparisons

      Petersen, K. D., Christensen, Henrik, Bisgaard, M. & Olsen, John Elmerdahl, 2001, In: Microbiology. 147, p. 2739-2748 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    365. Published

      Identification and characterisation of the free ranging local chicken ecotypes in Tanzania

      Msoffe, P. L. M., Mtambo, M. M. A., Minga, U. M., Yongolo, M. G. S., Gwakisa, P. S. & Olsen, John Elmerdahl, 2001. 10 p.

      Research output: Contribution to conference › Paper › Research

    366. Published

      Improving the Health and Productivity of the Rual Chisken in Africa: Research and Development Efforts in Tanzania

      Minga, U. M., Mtambo, M. M. A., Katule, A. M., Mutayoba, S. K., Mwalusanya, N. A., Lawrence, P., Mdegela, R. H. & Olsen, John Elmerdahl, 2001, Aciar proceedings. Editors: R. G. Alders and P. B. Spradbrow (ed.). 103 ed. Austarlian Centre for International Agricultural Research, 6 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    367. Published

      Investigations into the host specific infection of the avian host by Salmonella serotype Gallinarum

      Olsen, John Elmerdahl, Chadfield, M. S., Aabo, S. & Christensen, Jens Peter, 2001. 1 p.

      Research output: Contribution to conference › Paper › Research

    368. Published

      Is characterization of a single isolate sufficient for valid publication of a new genus or species? proposal to modify recommendation 30b of the Bacteriological code (1990 revision)

      Christensen, Henrik, Bisgaard, M., Frederiksen, W., Mutters, R., Kuhnert, P. & Olsen, John Elmerdahl, 2001, In: International Journal of Systematic and Evolutionary Microbiology. 51, p. 2221-2225 5 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    369. Published

      Ny veterinær studieordning i støbeskeen

      Olsen, John Elmerdahl & Strøm, H., 2001, In: Dansk Veterinærtidsskrift. 84, 16, p. 11-14 4 p.

      Research output: Contribution to journal › Journal article › Communication

    370. Published

      Nye principper for undervisning

      Olsen, John Elmerdahl & Strøm, H., 2001, In: Det Levende Universitet. 12, p. 10 1 p.

      Research output: Contribution to journal › Journal article › Communication

    371. Published

      Persistence of vancomycin resistant enterococci (VRE) in broiler flocks and broiler houses after the vancomycin ban in Denmark

      Heuer, O. E., Pedersen, K., Bogø Jensen, L., Madsen, M. & Olsen, John Elmerdahl, 2001.

      Research output: Contribution to conference › Paper › Research

    372. Published

      Phenotypes including immunocompetence in scavenging local chicken ecotypes in Tanzania

      Msoffe, P. L. M., Minga, U. M., Olsen, John Elmerdahl, Yongolo, M. G. S., Juul-Madsen, H. R., Gwakisa, P. S. & Mtambo, M. M. A., 2001, In: Tropical Animal Health and Production. 33, p. 341-354 14 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    373. Published

      Productivity of local chickens under village manegement conditions

      Mwalusanya, N. A., Katule, A. M., Mutayoba, S. K., Mtambo, M. M. A., Olsen, John Elmerdahl & Minga, U. M., 2001, In: Tropical Animal Health and Production. 34, p. 405-416 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    374. Published

      Random amplification of polymorphic DNA and phenotypic typing of Zimbabwean isolates of Pasteurella multocida

      Dziva, F., Christensen, Henrik, Olsen, John Elmerdahl & Mohan, K., 2001, In: Veterinary Microbiology. 82, p. 361-372 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    375. Published

      Smitte fra husdyrgødning: råd og fakta

      Lau Baggesen, D., Bager, F., Rattenborg, E., Olsen, John Elmerdahl, Bagger, J., Mikél Jensen, A., Steffensen, M. & Attermann Nielsen, K., 2001

      Research output: Other contribution › Communication

    376. Published

      Specific detection of Pasteurella multocida in chickens with fowl cholera and in pig lung tissues using fluorescent rRNA in situ hybridization

      Mbuthia, P. G., Christensen, Henrik, Boye, M., Dumong Petersen, K. M., Bisgaard, M., Nyaga, P. N. & Olsen, John Elmerdahl, 2001, In: Journal of Clinical Microbiology. 39, 7, p. 2627-2633 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    377. Published

      Taxonomy of taxon 9 of Bisgaard isolated from diseased horses and proposal of Actinobacillus hippikon sp. nov.

      Christensen, Henrik, Bisgaard, M. & Olsen, John Elmerdahl, 2001. 1 p.

      Research output: Contribution to conference › Paper › Research

    378. Published

      The role of flagella and chemotaxis on virulence of Salmonella enterica serotypes in the murine and avian host

      Jensen, K. H., Chadfield, M. S., Christensen, Jens Peter & Olsen, John Elmerdahl, 2001. 1 p.

      Research output: Contribution to conference › Paper › Research

    379. Published

      Veterinær studieordning i støbeskeen

      Olsen, John Elmerdahl & Strøm, H., 2001, In: Det Levende Universitet. 12, p. 6-8 3 p.

      Research output: Contribution to journal › Journal article › Communication

    380. 2000
    381. Published

      16S to 23S rRNA spacer fragment length polymorphism of Salmonella enterica at subspecies and serotype levels

      Christensen, Henrik, Lange Møller, P., Vogensen, Finn Kvist & Olsen, John Elmerdahl, 2000, In: Journal of Applied Microbiology. 89, p. 130-136 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    382. Published

      Characterisation of streptomycin resistance determinants in Danish isolates of Salmonella Typhimurium

      Madsen, L., Aarestrup, F. M. & Olsen, John Elmerdahl, 2000, In: Veterinary Microbiology. 75, p. 73-82 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    383. Published

      Characterization of E. coli isolates originating from a Danish broiler parent flock during a longitudinal study

      Christensen, Jens Peter, Brown, D. J., Olsen, John Elmerdahl & Bisgaard, M., 2000.

      Research output: Contribution to conference › Paper › Research

    384. Published

      Class I integrons containing a dhfrI trimethoprim resistance gene cassette in aquatic Acinetobacter spp.

      Petersen, A., Guardabassi, Luca, Dalsgaard, Anders & Olsen, John Elmerdahl, 2000, In: FEMS Microbiology Letters. 182, p. 73-76 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    385. Published

      DNA-DNA hybridization determined in micro-wells using covalent attachment of DNA

      Christensen, Henrik, Angen, Ø., Mutters, R., Olsen, John Elmerdahl & Bisgaard, M., 2000, In: International Journal of Systematic and Evolutionary Microbiology. 50, p. 1095-1102 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    386. Published

      DNA-based methods for detection of food-borne bacterial pathogens

      Olsen, John Elmerdahl, 2000, In: Food Research International. 33, p. 257-266 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    387. Published

      Development of an in vivo model for study of intestinal invasion by Salmonella enterica in chickens

      Aabo, S., Christensen, Jens Peter, Chadfield, M. S., Carstensen, B., Jensen, T. K., Bisgaard, M. & Olsen, John Elmerdahl, 2000, In: Infection and Immunity. 68, 12, p. 7122-7125 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    388. Published

      Distribution and in-vitro transfer of tetracycline resistance determinants in clinical and aquatic Acinetobacter strains

      Guardabassi, Luca, Dijkshoorn, L., Collard, J. -., Olsen, John Elmerdahl & Dalsgaard, Anders, 2000, In: Journal of Medical Microbiology. 49, p. 929-936 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    389. Published

      Distribution of tetracycline resistance determinants A to E and transfer in vitro of tetracycline resistance in clinical and aquatic Acinetobacter strains

      Guardabassi, Luca, Dijkshoorn, L., Olsen, John Elmerdahl & Dalsgaard, Anders, 2000, In: Journal of Medical Microbiology. 49, p. 829-836 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    390. Published

      Host adapted serotypes of Salmonella enterica

      Uzzau, S., Brown, D. J., Wallis, T., Rubino, S., Leori, G., Bernard, S., Casadesús, J., Platt, D. J. & Olsen, John Elmerdahl, 2000, In: Epidemiology and Infection. 125, p. 229-255 27 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    391. Published

      Increase in the prevalence of oxolinic acid resistant Acinetobacter spp. observed in a stream receiving the effluent from a freshwater trout farm following the treatment with oxolinic acid-medicated feed

      Guardabassi, Luca, Dalsgaard, Anders, Raffatellu, M. & Olsen, John Elmerdahl, 2000, In: Suisanzoshoku. 188, p. 205-218 14 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    392. Published

      Molecular epidemiology of Salmonella gallinarum in chickens in Tanzania

      Mdegela, R. H., Yongolo, M. G. S., Minga, U. M. & Olsen, John Elmerdahl, 2000, In: Avian Pathology. 29, p. 457-463 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    393. Published

      Molecular typing of Salmonella

      Olsen, John Elmerdahl, 2000, Salmonella in domestic animals. Wray, C. & Wray, A. (eds.). Wallingford: CABI Publishing, p. 429-446 18 p.

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research

    394. Published

      Random amplification of polymorphic DNA and capsular typing of Zimbabwean isolates of Pasteurella multocida

      Dziva, F., Christensen, Henrik, Olsen, John Elmerdahl & Mohan, K., 2000.

      Research output: Contribution to conference › Paper › Research

    395. Published

      Selektion for antibiotikaresistens i Acinetobacter spp. i spildevand

      Petersen, A., Guardabassi, Luca, Olsen, John Elmerdahl & Dalsgaard, Anders, 2000, In: Dansk Veterinærtidsskrift. 83, 7, p. 6-9 4 p.

      Research output: Contribution to journal › Journal article › Research

    396. Published

      Sequence variation of the 16S to 23S rRNA spacer region in Salmonella enterica

      Christensen, Henrik, Lange Møller, P., Vogensen, Finn Kvist & Olsen, John Elmerdahl, 2000, In: Research in Microbiology. 151, p. 37-42 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    397. Published

      Vejen til en ny veterinær studieordning

      Olsen, John Elmerdahl, 2000, In: Dansk Veterinærtidsskrift. 83, 16, p. 19-21 3 p.

      Research output: Contribution to journal › Journal article › Research

    398. Published

      Virulence characterization of a strain of Salmonella enterica subspecies houten (subspecies iv) with chromosomal integrated Salmonella plasmid virulence (spv) genes

      Aabo, S., Brown, D. J. & Olsen, John Elmerdahl, 2000, In: Research in Microbiology. 151, p. 183-189 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    399. 1999
    400. Published

      Antibiotic resistance: genetic mechanisms and mobility

      Olsen, John Elmerdahl, 1999, In: Acta Veterinaria Scandinavica (Print Edition). 92, p. 15-22 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    401. Published

      Anvendelse af antibiotika i landbruget: betydning for udvikling af antibiotikaresistente bakterier

      Olsen, John Elmerdahl & Aarestrup, F. M., 1999, In: Miljoesk. 16, p. 16-23 8 p.

      Research output: Contribution to journal › Journal article › Communication

    402. Published

      Differentiation of Campylobacter coli and C. jejuni by length and DNA sequence of the 16S-23S rRNA internal spacer region

      Christensen, Henrik, Jørgensen, K. & Olsen, John Elmerdahl, 1999, In: Microbiology. 145, p. 99-105 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    403. Published

      Host specificity of Salmonella serotypes

      Olsen, John Elmerdahl & Chadfield, M., 1999. 1 p.

      Research output: Contribution to conference › Paper › Research

    404. Published

      Identification of lactic acid bacteria from chili bo, a Malaysian food ingredient

      Leisner, Jørgen, Pot, B., Christensen, Henrik, Rusul, G., Olsen, John Elmerdahl, Wee, B. W., Muhamad, K. & Ghazali, M., 1999, In: Applied and Environmental Microbiology. 65, 2, p. 599-605 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    405. Published

      Invasion af forskellige Salmonella serotyper bestemt ved in vivo og in vitro modeller

      Christensen, Jens Peter, Aabo, S., Chadfield, M. S., Carstensen, B., Olsen, John Elmerdahl & Bisgaard, M., 1999. 1 p.

      Research output: Contribution to conference › Paper › Research

    406. Published

      Levels of virulence are not determined by genomic lineage of Salmonella enterica serotype Enteritidis strains

      Olsen, John Elmerdahl, Tiainen, T. & Brown, D. J., 1999, In: Epidemiology and Infection. 123, p. 423-430 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    407. Published

      Navneændringer og nye bakteriearter af veterinær betydning

      Christensen, Henrik, Aabo, S., Aalbæk, Bent, Bisgaard, M. & Olsen, John Elmerdahl, 1999, In: Dansk Veterinærtidsskrift. 82, 4, p. 108-112 5 p.

      Research output: Contribution to journal › Journal article › Research

    408. Published

      New methods for detection and isolation of food borne pathogenic bacteria

      Olsen, John Elmerdahl, 1999. 3 p.

      Research output: Contribution to conference › Paper › Research

    409. Published

      Nye principper for navngivning af bakterier

      Christensen, Henrik, Olsen, John Elmerdahl & Bisgaard, M., 1999, In: Dansk Veterinærtidsskrift. 82, 4, p. 102-107 6 p.

      Research output: Contribution to journal › Journal article › Research

    410. Published

      Occurrence of the blaZ gene in penicillin resistant Staphylococcus aureus isolated from bovine mastitis in Denmark

      Vesterholm-Nielsen, M., Ølholm Larsen, M., Olsen, John Elmerdahl & Aarestrup, F. M., 1999, In: Acta Veterinaria Scandinavica (Print Edition). 40, 3, p. 279-286 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    411. Published

      Phage type conversion in Salmonella enterica serotype enteritidis caused by the introduction of a resistance plasmid of incompatibility group X (IncX)

      Brown, D. J., Lau Baggesen, D., Platt, D. J. & Olsen, John Elmerdahl, 1999, In: Epidemiology and Infection. 122, p. 19-22 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    412. Published

      Phenotypic characterization and antibiotic resistance of Acinetobacter spp. isolated from aquatic sources

      Guardabassi, Luca, Dalsgaard, Anders & Olsen, John Elmerdahl, 1999, In: Journal of Applied Microbiology. 87, p. 659-667 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    413. Published

      Population genetics of Salmonella

      Christensen, Henrik & Olsen, John Elmerdahl, 1999. 1 p.

      Research output: Contribution to conference › Paper › Research

    414. Published

      Rat dorsal root ganglia neurons as a model for Listeria monocytogenes infections in culture

      Dons, L., Weclewicz, K., Jin, Y., Bindseil, E., Olsen, John Elmerdahl & Kristensson, K., 1999, In: Medical Microbiology and Immunology. 188, p. 15-21 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    415. Published

      Risikofaktorer forbundet med forekomst af Salmonella enterica serovar Typhimurium hos slagtekyllinger i Danmark

      Skov, M. N., Angen, Ø., Chriél, M., Olsen, John Elmerdahl & Bisgaard, M., 1999. 1 p.

      Research output: Contribution to conference › Paper › Research

    416. Published

      Risk factors associated with Salmonella enterica serovar typhimurium infection in Danish broiler flocks

      Skov, M. N., Angen, Ø., Chriél, M., Olsen, John Elmerdahl & Bisgaard, M., 1999, In: Poultry Science. 78, p. 848-854 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    417. Published

      Taxonomic relationships of the [Pasteurella] haemolytica complex as evaluated by DNA-DNA hybridizations and 16S rRNA sequencing with proposal of Mannheimia haemolytica gen. nov., comb. nov., Mannheimia granulomatis comb. nov., Mannheimia glucosida sp. nov., Mannheimia ruminalis sp. nov. and Mannheimia varigena sp. nov.

      Angen, Ø., Mutters, R., Caugant, D. A., Olsen, John Elmerdahl & Bisgaard, M., 1999, In: International Journal of Systematic and Evolutionary Microbiology. 49, p. 67-86 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    418. Published

      Udvikling og brug af modeller til studier af Salmonellas evne til at invadere i tarmen

      Olsen, John Elmerdahl, Aabo, S., Christensen, Jens Peter, Chadfield, M. S., Carstensen, B., Jensen, T. K. & Bisgaard, M., 1999. 1 p.

      Research output: Contribution to conference › Paper › Research

    419. 1998
    420. Published

      A ¤typing concept for Salmonella

      Olsen, John Elmerdahl, Lau Baggesen, D., Christensen, Henrik & Platt, D. J., 1998, EUR. Aspán, A. & Mulder, R. W. A. W. (eds.). 18209 ed. Publications Office, p. 97-103 7 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    421. Published

      Antibiotic resistance in Acinetobacter spp. isolated from sewers receiving waste effluent from a hospital and a pharmaceutical plant

      Guardabassi, Luca, Petersen, A., Olsen, John Elmerdahl & Dalsgaard, Anders, 1998, In: Applied and Environmental Microbiology. 64, 9, p. 3499-3502 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    422. Published

      Antimicrobial resistance mechanism: entering the post-antimicrobial era?

      Olsen, John Elmerdahl, Chriél, M., Aalbæk, Bent & Dietz, Hans Henrik, 1998. 5 p.

      Research output: Contribution to conference › Paper › Research

    423. Published

      Diversity of lactic acid bacteria isolated from traditional Malaysian foods

      Leisner, Jørgen, Christensen, Henrik, Olsen, John Elmerdahl, Pot, B., Rusul, G., Wee, B. W., Muhamad, K. & Ghazali, H. M., 1998. 1 p.

      Research output: Contribution to conference › Paper › Research

    424. Published

      Phylogenetic relationships of Salmonella based on DNA sequence comparison of atpD encoding the beta subunit of ATP synthase

      Christensen, Henrik & Olsen, John Elmerdahl, 1998, In: FEMS Microbiology Letters. 161, p. 89-96 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    425. Published

      Phylogenetic relationships of Salmonella based on rRNA sequences

      Christensen, Henrik, Nordentoft, S. & Olsen, John Elmerdahl, 1998, In: International Journal of Systematic and Evolutionary Microbiology. 48, p. 605-610 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    426. Published

      Scavenging local chickens in Tanzania: is there room for improvement in productivity?

      Msoffe, P. L. M., Mtambo, M. M. A., Minga, U. M., Gwakisa, P. S., Katule, A. M., Mutayoba, S., Mdegela, R. H., Mwalusanya, N. A., Yongolo, M. G. S. & Olsen, John Elmerdahl, 1998, In: Tanzanian Veterinary Journal. 18, 4, p. 117-126 10 p.

      Research output: Contribution to journal › Journal article › Research

    427. Published

      Secretory pathways in Salmonella typhimurium-induced fluid accumulation in the porcine small intestine

      Grøndahl, M. L., Majgaard Jensen, G., Nielsen, C. G., Skadhauge, E., Olsen, John Elmerdahl & Berner Hansen, M., 1998, In: Journal of Medical Microbiology. 47, p. 151-157 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    428. Published

      Tracing of pathogenic bacteria

      Olsen, John Elmerdahl, 1998, Ikke angivet. Svarre, M. (ed.). Levnedsmiddelcentret, p. 33 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    429. Published

      Veterinærstuderende gennem 25 år

      Olsen, John Elmerdahl, Flagstad, A. & Hobolt, K., 1998, Veterinærskolen 225 år : rids af de seneste års udvikling. Lefmann, G. & Katic, I. (eds.). København: Jordbrugsforlaget, p. 67-76 10 p.

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Communication

    430. 1997
    431. Published

      A ¤typing concept for Salmonella

      Olsen, John Elmerdahl, Lau Baggesen, D., Christensen, Henrik & Platt, D. J., 1997. 1 p.

      Research output: Contribution to conference › Paper › Research

    432. Published

      Antibiotikaresistens: er det gammel vin på nye flasker?

      Nielsen, B., Olsen, John Elmerdahl & Aarestrup, F. M., 1997, In: Veterinærinformation. 1, p. 3-10 8 p.

      Research output: Contribution to journal › Journal article › Communication

    433. Published

      Antibiotikaresistente bakterier i det akvatiske miljø

      Petersen, A., Olsen, John Elmerdahl & Dalsgaard, Anders, 1997, In: Dansk Veterinærtidsskrift. 80, 16, p. 700-704 5 p.

      Research output: Contribution to journal › Journal article › Research

    434. Published

      Anvendelse af ITS (internal transcribed spacer) fragmentlængde polymorfi til typning indenfor Salmonella og Campylobacter

      Christensen, Henrik, Jørgensen, K., Lange Møller, P. & Olsen, John Elmerdahl, 1997, Ikke angivet. Levnedsmiddelcentret, p. 187 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    435. Published

      DNA-diagnostik i relation til levnedsmiddelmikrobiologi

      Olsen, John Elmerdahl, 1997, Ikke angivet. Levnedsmiddelcentret, p. 55 1 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    436. Published

      Differences detected in the expression of Salmonella plasmid virulence (spv) genes in different serotypes of Salmonella enterica by the use of an spvB-cat fusion reporter gene

      Brown, D. J., Chadfield, M. S. & Olsen, John Elmerdahl, 1997. 1 p.

      Research output: Contribution to conference › Paper › Research

    437. Published

      Differentiation of Shewanella putrefaciens and Shewanella alga on the basis of whole-cell protein profiles, rybotyping, phenotypic characterization, and 16S rRNA gene sequence analysis

      Vogel, B. F., Jørgensen, K., Christensen, Henrik, Olsen, John Elmerdahl & Gram, L., 1997, In: Applied and Environmental Microbiology. 63, 6, p. 2189-2199 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    438. Published

      Effect of indomethacin on Salmonalla typhimurium and cholera toxin-induced fluid accumulation in pig jejunum

      Unmack, M. A., Grøndahl, M. L., Olsen, John Elmerdahl, Skadhauge, E. & Berner Hansen, M., 1997. 3 p.

      Research output: Contribution to conference › Paper › Research

    439. Published

      Effect of ondansetron on Salmonella typhimurium-induced net fluid accumulation in the pig jejunum in vivo

      Majgaard Jensen, G., Grøndahl, M. L., Grøndahl Nielsen, C., Skadhauge, E., Olsen, John Elmerdahl & Berner Hansen, M., 1997, In: Comparative Biochemistry and Physiology - Part A: Comparative Physiology. 118, 2, p. 297-299 3 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    440. Published

      Forekomst af antibiotikaresistente bakterier i akvatiske miljøer: litteraturstudium

      Petersen, A., Olsen, John Elmerdahl & Dalsgaard, Anders, 1997, København: Frontlinien, Miljøministeriet. 60 p. (Miljøprojekt; No. nr. 361).

      Research output: Book/Report › Book › Education

    441. Published

      Further studies of the relationships among strains classified as taxon 15, taxon 18, taxon 20, (Pasteurella) granulomatis or the (Pasteurella) haemolytica-complex in ruminants using quantitative evaluation of phenotypic data

      Angen, Ø., Olsen, John Elmerdahl & Bisgaard, M., 1997, In: Zentralblatt für Bakteriologie. 286, p. 317-332 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    442. Published

      Genomic relationships between selected phage types of Salmonella enterica subsp. enterica serotype typhimurium defined by ribotyping, IS200 typing and PFGE

      Olsen, John Elmerdahl, Skov, M. N., Angen, Ø., Threlfall, E. J. & Bisgaard, M., 1997, In: Microbiology. 143, p. 1471-1479 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    443. Published

      Genotypic relationships among strains classified under the (Pasteurella) haemolytica-complex as indicated by ribotyping and multilocus enzyme electrophoresis

      Angen, Ø., Caugant, D. A., Olsen, John Elmerdahl & Bisgaard, M., 1997, In: Zentralblatt für Bakteriologie. 286, p. 333-354 22 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    444. Published

      Hatchery-borne Salmonella enterica serovar Tennessee infections in broilers

      Christensen, Jens Peter, Brown, D. J., Madsen, M., Olsen, John Elmerdahl & Bisgaard, M., 1997, In: Avian Pathology. 26, p. 155-168 14 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    445. Published

      Molecular typing of Salmonella: an overview

      Olsen, John Elmerdahl, 1997. 1 p.

      Research output: Contribution to conference › Paper › Research

    446. Published

      Phylogenetic relations of Salmonella established by 23S rRNA gene sequence comparison

      Christensen, Henrik, Nordentoft, S. & Olsen, John Elmerdahl, 1997. 6 p.

      Research output: Contribution to conference › Paper › Research

    447. Published

      Relationships among strains classified with the ruminant Pasteurella haemolytica-complex using quantitative evaluation of phenotypic data

      Angen, Ø., Aalbæk, Bent, Falsen, E., Olsen, John Elmerdahl & Bisgaard, M., 1997, In: Zentralblatt für Bakteriologie. 285, p. 459-479 21 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    448. Published

      Risk factors associated with Salmonella enterica serovar typhimurium infection in Danish broiler flocks

      Skov, M. N., Angen, Ø., Chriél, M., Olsen, John Elmerdahl & Bisgaard, M., 1997, Proceedings. p. 343-346 4 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    449. Published

      Salmonella plasmid virulence (spv) gene expression in different serotypes of Salmonella enterica measured by the use of spvB fusion reporter genes

      Brown, D. J., Chadfield, M. S. & Olsen, John Elmerdahl, 1997. 3 p.

      Research output: Contribution to conference › Paper › Research

    450. Published

      Secretory pathways in Salmonella Typhimurium-induced fluid accumulation in the porcine small intestine

      Grøndahl, M. L., Majgaard Jensen, G., Nielsen, C. G., Skadhauge, E., Olsen, John Elmerdahl & Berner Hansen, M., 1997, In: Journal of Medical Microbiology. 46, p. 1-7 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    451. Published

      The ¤application of polymerase chain reaction to the meat industry

      Olsen, John Elmerdahl, Boel, J. & Aabo, S., 1997, Factors effecting the microbial quality of meat. Hinton, M. H. & Rowlings, C. (eds.). University of Bristol Press, Vol. 4. p. 135-141 7 p. (Microbial methods for the meat industry).

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research

    452. Published

      The ¤characterization of a naturally occurring RFLP variant of the Salmonella enterica serovar gallinarum biovar gallinarum virulence plasmid associated with reduced virulence in chickens

      Christensen, Jens Peter, Barrow, P. A., Olsen, John Elmerdahl, Brown, D. J. & Bisgaard, M., 1997. 2 p.

      Research output: Contribution to conference › Paper › Research

    453. 1996
    454. Published

      Correlation between viable counts of Salmonella Gallinarum in spleen and liver and the development of anaemia in chickens as seen in experimental fowl typhoid

      Christensen, Jens Peter, Barrow, P. A., Olsen, John Elmerdahl, Dirch Poulsen, J. S. & Bisgaard, M., 1996, In: Avian Pathology. 25, p. 769-783 15 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    455. Published

      Detection of Campylobacter jejuni and Camp. coli in chicken faecal samples by PCR

      Rasmussen, H. N., Olsen, John Elmerdahl, Jørgensen, K. & Rasmussen, O. F., 1996, In: Letters in Applied Microbiology. 23, p. 363-366 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    456. Published

      Distribution and antibiotic resistance patterns of common mastitis pathogens (gram-positive cocci) in selected dairy herds of three dairy farming sectors in Zimbabwe

      Makaya, P. V., Aarestrup, F. M. & Olsen, John Elmerdahl, 1996, In: Zimbabwe Veterinary Journal. 27, 2, p. 65-75 11 p.

      Research output: Contribution to journal › Journal article › Research

    457. Published

      Five-hydroxytryptamine receptor antagonist reduces salmonella-induced net fluid accumulation in porcine small intestine

      Hansen, M. B., Grøndahl, M. L., Jensen, G. M., Nielsen, C., Olsen, John Elmerdahl & Skadhauge, E., 1996. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    458. Published

      Genomic lineage of Salmonella enterica serotype Gallinarum

      Olsen, John Elmerdahl, Skov, M. N., Christensen, Jens Peter & Bisgaard, M., 1996, In: Journal of Medical Microbiology. 45, p. 413-418 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    459. Published

      Metoder til eftersporing af patogene bakteriers smitte gennem levnedsmidler: eksemplificeret ved slagtekyllingeproduktion

      Olsen, John Elmerdahl, Brown, D. J. & Bisgaard, M., 1996. 1 p.

      Research output: Contribution to conference › Poster › Research

    460. Published

      Polyphasic characterization of organisms within the [Pasteurella] haemolytica complex

      Angen, Ø., Caugant, D. A., Olsen, John Elmerdahl & Bisgaard, M., 1996. 1 p.

      Research output: Contribution to conference › Paper › Research

    461. Published

      Påvisning af salmonella populationer udfra ribosomale DNA sekvenser

      Christensen, Henrik & Olsen, John Elmerdahl, 1996. 1 p.

      Research output: Contribution to conference › Poster › Research

    462. Published

      Relation between subspecies of Salmonella enterica by 23S rDNA sequence comparison

      Christensen, Henrik & Olsen, John Elmerdahl, 1996. 1 p.

      Research output: Contribution to conference › Poster › Research

    463. Published

      Sequence diversity of the flagellin gene of Listeria monocytogenes

      Dons, L., Rasmussen, O. F. & Olsen, John Elmerdahl, 1996. 3 p.

      Research output: Contribution to conference › Paper › Research

    464. Published

      The ¤application of PCR to the meat industry

      Olsen, John Elmerdahl, 1996.

      Research output: Contribution to conference › Paper › Research

    465. Published

      The ¤development and application of oligo nucleotide probes and PCR methods specific for the genus Salmonella and for S. Typhimurium

      Olsen, John Elmerdahl, Aabo, S. & Rossen, L., 1996. 1 p.

      Research output: Contribution to conference › Conference abstract for conference › Research

    466. Published

      The ¤development of oligonucleotide probes and PCR methods specific for Salmonella or for Salmonella typhimurium and application to detection in naturally contaminated samples

      Olsen, John Elmerdahl, 1996.

      Research output: Contribution to conference › Paper › Research

    467. Published

      Virulence and genotype stability of Salmonella enterica serovar Berta during a natural outbreak

      Olsen, John Elmerdahl, Skov, M. N., Brown, D. J., Christensen, Jens Peter & Bisgaard, M., 1996, In: Epidemiology and Infection. 116, p. 267-274 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    468. Published

      Øvelsesvejledning til kursus i Klinisk Mikrobiologi

      Olsen, John Elmerdahl, Aalbæk, Bent & Brown, D. J., 1996

      Research output: Book/Report › Compendium/lecture notes › Education

    469. 1995
    470. Published

      Probes and polymerase chain reaction for detection of food-borne bacterial pathogens

      Olsen, John Elmerdahl, Aabo, S., Hill, W., Notermans, S., Wernars, K., Granum, P. E., Popovic, T., Rasmussen, H. N. & Olsvik, Nov 1995, In: International Journal of Food Microbiology. 28, 1, p. 1-78 78 p.

      Research output: Contribution to journal › Review › Research › peer-review

    471. Published

      Research note: Detection of Salmonella in minced meat by the polymerase chain reaction method

      Aabo, S., Andersen, J. K. & Olsen, John Elmerdahl, Sep 1995, In: Letters in Applied Microbiology. 21, 3, p. 180-182 3 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    472. Published

      Oligonucleotide probes specific for the genus Salmonella and for Salm. typhimurium

      Olsen, John Elmerdahl, Aabo, S., Rasmussen, O. F. & Rossen, L., Mar 1995, In: Letters in Applied Microbiology. 20, 3, p. 160-163 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    473. Published

      Abstract i forbindelse med præsentation af poster til: Avancerede målesystemer og databehandling til proces- og produktudvikling, 1995, KVL

      Christensen, Henrik & Olsen, John Elmerdahl, 1995

      Research output: Other contribution › Communication

    474. Published

      Antibiotikumresistente Escherichia coli i tarmfloraen hos danske svin og kalve i perioden 1970-1988

      Aalbæk, Bent, Olsen, John Elmerdahl, Nielsen, B., Larsen, J. L., Sørensen, M., Errebo Larsen, H. & Rasmussen, J., 1995, In: Dansk Veterinærtidsskrift. 78, 20, p. 1026-1029 4 p.

      Research output: Contribution to journal › Journal article › Research

    475. Published

      Characterization of non-virulence plasmids with homology to the virulence plasmid of Salmonella dublin

      Aabo, S., Olsen, John Elmerdahl, Threlfall, E. J. & Brown, D. J., 1995, In: Research in Microbiology. 146, p. 751-759 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    476. Published

      DNA-probes and PCR for identification of Salmonella

      Olsen, John Elmerdahl, Aabo, S. & Rossen, L., 1995, Southeast Asian journal of tropical medicine and public health. 26 ed. p. 222-224 3 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    477. Detection of Yersinia enterocolitica O:3 in faecal samples and tonsil swabs from pigs using IMS and PCR

      Rasmussen, H. N., Rasmussen, O. F., Christensen, Henrik & Olsen, John Elmerdahl, 1995, In: Journal of Applied Bacteriology. 78, 5, p. 563-8

      Research output: Contribution to journal › Journal article › Research › peer-review

    478. Published

      Immune reaction of pigs following intra-gastric or ileal inoculation of attenuated Salmonella typhi

      Loftager, M. K., Olsen, John Elmerdahl & Eriksen, L., 1995, In: Advances in Experimental Medicine and Biology. 371, B, p. 913-917 5 p.

      Research output: Contribution to journal › Conference article › Research › peer-review

    479. Published

      Listeria monocytogenes exists in at least three evolutionary lines: Evidence from flagellin, invasive associated protein and listeriolysin O genes

      Rasmussen, O. F., Skouboe, P., Dons, L., Rosen, L. & Olsen, John Elmerdahl, 1995, In: Microbiology. 141, 9, p. 2053-2061 9 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    480. Published

      Molecular methods for control of sources and routes of microbial infections

      Olsen, John Elmerdahl, 1995, Meat quality and safety as affected by primary production. Møller, A. J., Mielche, M. M. & Barton-Gade, P. (eds.). p. 174-184 11 p.

      Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Communication

    481. Published

      Prevalence of Salmonella in dry pelleted chicken manure samples obtained from shrimp farms in a major shrimp production area in Thailand

      Dalsgaard, Anders & Olsen, John Elmerdahl, 1995, In: Suisanzoshoku. 136, p. 291-295 5 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    482. Published

      RFLP variation in Salmonella gallinarum virulence plasmids and the effect on virulence

      Christensen, Jens Peter, Barrow, A. P., Olsen, John Elmerdahl, Brown, D. J. & Bisgaard, M., 1995, Southeast Asian journal of tropical medicine and public health. 26 ed. p. 160-162 3 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    483. Published

      The ¤development of oligonucleotide probes and PCR methods specific for Salmonella or for S. serotype typhimurium and application to detection in naturally contaminated samples

      Olsen, John Elmerdahl, Aabo, S. & Rossen, L., 1995, Southeast Asian journal of tropical medicine and public health. 26 ed. p. 92-98 7 p.

      Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

    484. 1994
    485. Published

      RAPD analysis of Yersinia enterocolitica

      Rasmussen, H. N., Olsen, John Elmerdahl & Rasmussen, O. F., Nov 1994, In: Letters in Applied Microbiology. 19, 5, p. 359-362 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    486. Published

      Stability of plasmids in five strains of Salmonella maintained in stab culture at different temperatures

      Olsen, John Elmerdahl, Brown, D. J., Baggesen, D. L. & Bisgaard, M., Aug 1994, In: Journal of Applied Bacteriology. 77, 2, p. 155-159 5 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    487. Published

      Genomic lineage of Salmonella enterica serovar Dublin

      Olsen, John Elmerdahl & Skov, M., Jun 1994, In: Veterinary Microbiology. 40, 3-4, p. 271-282 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    488. Published

      Specific detection of pathogenic yersinia enterocolitica by two-step pcr using hot-start and dmso

      Rasmussen, H. N., Rasmussen, O. F., Andersen, J. K. & Olsen, John Elmerdahl, Apr 1994, In: Molecular and Cellular Probes. 8, 2, p. 99-108 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    489. Published

      Characterization of two putative Listeria monocytogenes encoding polypeptides homologous to the sensor protein CheA and the responce regulator CheY of chemotoxis

      Dons, L. E., Olsen, John Elmerdahl & Rasmussen, O. F., 1994, In: The jounr. of Seguencing and Mapping. 4, p. 301 12 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    490. Published

      Characterization of two putative listeria monocytogenes genes encoding polypeptides homologous to the sensor protein chea and the response regulator chey of chemotaxis

      Dons, L., Olsen, John Elmerdahl & Rasmussen, O. F., 1994, In: DNA Sequence. 4, 5, p. 301-311 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    491. Published

      Clonal lines of Salmonella enterica serotype Enteritidis documented by IS200-, ribo-, pulsed-field gel electrophoresis and RFLP typing

      Olsen, John Elmerdahl, Skov, M. N., Threlfall, E. J. & Brown, D. J., 1994, In: Journal of Medical Microbiology. 40, 1, p. 15-22 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    492. Published

      Ribotyping of Aeromonas salmonicida subsp. salmonicida

      Nielsen, B., Olsen, John Elmerdahl & Larsen, J. L., 1994, In: Diseases of Aquatic Organisms. 18, 2, p. 155-158 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    493. 1993
    494. Published

      Ribotypes of Salmonella enterica serovar Gallinarum biovars gallinarum and pullorum

      Christensen, Jens Peter, Olsen, John Elmerdahl & Bisgaard, M., 1 Dec 1993, In: Avian Pathology. 22, 4, p. 725-738 14 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    495. Published

      Bacterial typing methods suitable for epidemiological analysis. Applications in investigations of salmonellosis among livestock.

      Olsen, John Elmerdahl, Brown, D. J., Skov, M. N. & Christensen, Jens Peter, Dec 1993, In: The Veterinary quarterly. 15, 4, p. 125-135 11 p.

      Research output: Contribution to journal › Review › Research › peer-review

    496. Published

      Salmonella identification by the polymerase chain reaction

      Aabo, S., Rasmussen, O. F., Roseen, L., Sørensen, P. D. & Olsen, John Elmerdahl, Jun 1993, In: Molecular and Cellular Probes. 7, 3, p. 171-178 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    497. Published

      Ribotypes and plasmid contents of Vibrio anguillarum strains in relation to serovar

      Olsen, John Elmerdahl & Larsen, J. L., 1993, In: Applied and Environmental Microbiology. 59, 11, p. 3863-3870 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    498. 1992
    499. Published

      Plasmid profiles and phage types of Salmonella typhimurium isolated from successive flocks of chickens on three parent stock farms

      Baggesen, D. L., Olsen, John Elmerdahl & Bisgaard, M., 1 Dec 1992, In: Avian Pathology. 21, 4, p. 569-579 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    500. Published

      Cloning and characterization of a gene encoding flagellin of Listeria monocytogenes

      Dons, L. & Olsen, John Elmerdahl, Oct 1992, In: Molecular Microbiology. 6, 20, p. 2919-2929 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    501. Published

      Characterization of Salmonella Enterica Serovar Gallinarum Biovars Gallinarum and Pullorum By Plasmid Profiling and Biochemical Analysis

      Christensen, Jens Peter, Olsen, John Elmerdahl, Hansen, H. C. & Bisgaard, M., 1 Sep 1992, In: Avian Pathology. 21, 3, p. 461-470 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    502. Published

      Evaluation of a Salmonella‐specific DNA probe by colony hybridization using non‐isotopic and isotopic labeling

      AABO, S., THOMAS, A., HALL, M. L. M., SMITH, H. R. & Olsen, John Elmerdahl, Jul 1992, In: APMIS. 100, 7-12, p. 623-628 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    503. Published

      Biochemical and molecular characterization of Salmonella enterica serovar berta, and comparison of methods for typing

      Olsen, John Elmerdahl & Bisgaard, M., Apr 1992, In: Epidemiology and Infection. 108, 2, p. 243-260 18 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    504. Published

      Plasmid profiles as an epidemiological marker in Salmonella enterica serovar berta infections: Comparison of isolates obtained from humans and poultry

      Olsen, John Elmerdahl, BROWN, D. J., GAARSLEV, K. & BISGAARD, M., Jan 1992, In: APMIS. 100, 1-6, p. 221-228 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    505. Published

      Cloning and characteriza

      Dons, L. E., Rasmussen, O. F. & Olsen, John Elmerdahl, 1992, In: Molecular Microbiology. (1992) 6 (20), p. 2919 11 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    506. Published

      Salmonella enterica: Infection, Cross Infection and Persistence within the Environment of a Broiler Parent Stock Unit in Denmark

      Brown, D. J., Olsen, John Elmerdahl & Bisgaard, M., 1992, In: Zentralblatt fur Bakteriologie. 277, 1, p. 129-138 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    507. 1991
    508. Published

      A rapid polymerase chain reaction (PCR)-based assay for the identification of Listeria monocytogenes in food samples

      Rossen, L., Holmstrøm, K. & Olsen, John Elmerdahl, Nov 1991, In: International Journal of Food Microbiology. 14, 2, p. 145-151 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    509. Published

      Plasmid profiles of Salmonella enterica serovar berta isolated from broilers in Denmark

      Bisgaard, M. & Olsen, John Elmerdahl, Jul 1991, In: APMIS. 99, 7-12, p. 609-614 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    510. Published

      Prevalence of antibiotic‐resistant Escherichia coli in Danish pigs and cattle

      Aalbæk, Bent & Olsen, John Elmerdahl, Jul 1991, In: APMIS. 99, 7-12, p. 1103-1110 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    511. Published

      Isolation of a Salmonella-specific DNA hybridization probe

      Olsen, John Elmerdahl, 1991, In: APMIS. 99, 2, p. 114-120 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    512. Published

      Listeria monocytogenes Isolates can be classified into two major types assording to the sequence of the listeriolysin gene.

      Rasmussen, O. F., Beck, T., Olsen, John Elmerdahl, Dons, L. & Rossen, L., 1991, In: Infection and Immunity. 1991, p. 3945 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    513. Published

      Listeria monocytogenes isolates can be classified into two major types according to the sequence of the listeriolysin gene

      Olsen, John Elmerdahl, Dons, L. & Rossen, L., 1991, In: Infection and Immunity. 59, 11, p. 3945-3951 7 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    514. Published

      Occurrence of plasmids in Danish isolates of Vibrio anguillarum serovars O1 and O2 and association of plasmids with phenotypic characteristics

      Olsen, John Elmerdahl, 1991, In: Applied and Environmental Microbiology. 57, 8, p. 2158-2163 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    515. 1990
    516. Published

      Infectivity of Eggs of Taenia taeniaeformis after Anerobic Digestion of Sewage Sludge – A Possible Model for Taenia saginata Egg Resistance

      Olsen, John Elmerdahl & Nansen, P., Sep 1990, In: Acta Veterinaria Scandinavica. 31, 3, p. 377-379 3 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    517. Published

      An improved method for rapid isolation of plasmid DNA from wild‐type Gram‐negative bacteria for plasmid restriction profile analysis

      Olsen, John Elmerdahl, May 1990, In: Letters in Applied Microbiology. 10, 5, p. 209-212 4 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    518. Published

      Restriction fragment length polymorphism of the Vibrio anguillarum serovar 01 virulence plasmid

      Olsen, John Elmerdahl, 1990, In: Applied and Environmental Microbiology. 56, 10, p. 3130-3132 3 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    519. Published

      The prevalance of plasmids in Danish bovine and human isolates of Salmonella dublin

      Olsen, John Elmerdahl, 1990, In: APMIS. 98, 8, p. 735-740 6 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    520. 1988
    521. Published

      Studies on the reduction of pathogenic and indicator bacteria in liquid pig manure treated by sedimentation and anaerobic filter digestion for methane generation

      Olsen, John Elmerdahl, 1988, In: Biological Wastes. 24, 1, p. 17-26 10 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    522. 1987
    523. Published

      Bacterial decimation times in anaerobic digestions of animal slurries

      Olsen, John Elmerdahl, 1987, In: Biological Wastes. 21, 3, p. 153-168 16 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    524. Published

      Inactivation of some parasites by anaerobic digestion of cattle slurry

      Olsen, John Elmerdahl & Nansen, P., 1987, In: Biological Wastes. 22, 2, p. 107-114 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    525. 1985
    526. Published

      On the reduction of Mycobacterium paratuberculosis in bovine slurry subjected to batch mesophilic or thermophilic anaerobic digestion

      Olsen, John Elmerdahl & Nansen, P., 1985, In: Agricultural Wastes. 13, 4, p. 273-280 8 p.

      Research output: Contribution to journal › Journal article › Research › peer-review

    ID: 4236663