John Elmerdahl Olsen
Professor
Veterinary Clinical Microbiology
Stigbøjlen 4, 1870 Frederiksberg C
Member of:
- 2017
- 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
- 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
- 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
- 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. 41-47Research output: Contribution to journal › Journal article › Research › peer-review
- 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
- 2016
- 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
- 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
- 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
- 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
- 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
- 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. 2076-2085Research output: Contribution to journal › Journal article › Research › peer-review
- 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. 46-51Research output: Contribution to journal › Journal article › Research › peer-review
- 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
- 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. 40-46Research output: Contribution to journal › Journal article › Research › peer-review
- 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
- 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
- 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. 143-148Research output: Contribution to journal › Journal article › Research › peer-review
- 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
- 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
- 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
- 2015
- 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
- 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
- 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
- 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
- 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
ID: 4236663
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The role of ClpP, RpoS and CsrA in growth and filament formation of Salmonella enterica serovar Typhimurium at low temperature
Research output: Contribution to journal › Journal article › Research › peer-review
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2245
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Identification of redundant metabolic pathways essential for virulence of Salmonella Typhimurium: Abstract book I3S International Symposium Salmonella and Salmonellosis, Saint-Malo, France
Research output: Contribution to conference › Conference abstract for conference › Research
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Adaptation of Salmonella Typhimurium to triclosan
Research output: Contribution to conference › Poster › Research
Published