Rikke Heidemann Olsen

Rikke Heidemann Olsen

Associate Professor


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  1. Published

    Virulence factors of Enterococcus faecalis of human and poultry origin seem to confirm the zoonotic potential of E. faecalis.

    Olsen, Rikke Heidemann, Schønheyder, H., Christensen, Henrik & Bisgaard, M., 2011, 17th World Veterinary Poultry Congress: proceedings. WVPA, p. 474-476 3 p.

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

  2. Published

    Variations in virulence of avian pathogenic Escherichia coli demonstrated by the use of a new in vivo infection model

    Pors, S. E., Olsen, Rikke Heidemann & Christensen, Jens Peter, 2014, In: Veterinary Microbiology. 170, 3-4, p. 368-374 7 p.

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

  3. Published

    Treatment with high-dose antidepressants severely exacerbates the pathological outcome of experimental Escherichia coli infections in poultry

    Kromann, Sofie, Kudirkiene, E., Li, L., Thoefner, Ida , Daldorph, E., Christensen, Jens Peter, Meng, H. & Olsen, Rikke Heidemann, 2017, In: PLoS ONE. 12, 10, 15 p., e0185914.

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

  4. Published

    Transmission and pathogenicity of Gallibacterium anatis and Escherichia coli in embryonated eggs

    Wang, C., Pors, S. E., Olsen, Rikke Heidemann & Bojesen, Anders Miki, 2018, In: Veterinary Microbiology. 217, p. 76-81 6 p.

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

  5. Published

    Transmission and genetic diversity of Enterococcus faecalis during hatch of broiler chicks

    Olsen, Rikke Heidemann, Christensen, Henrik & Bisgaard, M., 2012, In: Veterinary Microbiology. 160, 1-2, p. 214-221 8 p.

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

  6. Published

    Transmission and genetic diversity of Enterococcus faecalis among layer chickens during hatch

    Fertner, M. E., Olsen, Rikke Heidemann, Bisgaard, M. & Christensen, Henrik, 2011, In: Acta Veterinaria Scandinavica (Print). 53, 56, 6 p.

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

  7. Published

    The hygienic aspects in the management of strangles

    Fridberg, A., Adler, Ditte Marie Top, Jørgensen, M. G. & Olsen, Rikke Heidemann, 2023, In: Equine Veterinary Education. 35, 10, p. 540-550

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

  8. Published

    Systemic reactive amyloidosis - an age related problem of importance in broiler breeders

    Thoefner, Ida , Poulsen, Louise Ladefoged, Bisgaard, M., Christensen, Henrik, Olsen, Rikke Heidemann & Christensen, Jens Peter, Sep 2015.

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

  9. Published

    Staphylococcus agnetis, a potential pathogen in broiler breeders

    Poulsen, Louise Ladefoged, Thoefner, Ida , Bisgaard, M., Olsen, Rikke Heidemann, Christensen, Jens Peter & Christensen, Henrik, 2017, In: Veterinary Microbiology. 212, p. 1-6 6 p.

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

  10. Published

    Spread of avian pathogenic Escherichia coli ST117 O78:H4 in Nordic broiler production

    Ronco, T., Stegger, M., Olsen, Rikke Heidemann, Sekse, C., Nordstoga, A. B., Pohjanvirta, T., Lilje, B., Lyhs, U., Andersen, P. S. & Pedersen, K., 3 Jan 2017, In: BMC Genomics. 18, 8 p., 13.

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

  11. Published

    Short- and long-read metagenomics insight into the genetic contexts and hosts of mobile antibiotic resistome in Chinese swine farms

    Li, L., Xiao, Y., Olsen, Rikke Heidemann, Wang, C., Meng, H. & Shi, L., 2022, In: Science of the Total Environment. 827, 154352.

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

  12. 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

  13. Published

    Protective potential of an autogenous vaccine in an aerogenous model of escherichia coli infection in broiler breeders

    Kromann, Sofie, Olsen, Rikke Heidemann, Bojesen, Anders Miki, Jensen, Henrik Elvang & Thoefner, Ida , 2021, In: Vaccines. 9, 11, 1233.

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

  14. Published

    Population diversity and impact of Enterococcus faecalis in chickens

    Olsen, Rikke Heidemann, 2012, Department of Veterinary Disease Biology, University of Copenhagen. 125 p.

    Research output: Book/Report › Ph.D. thesis › Research

  15. Published

    Pathology and Molecular Characterization of Escherichia Coli Associated With the Avian Salpingitis-Peritonitis Disease Syndrome

    Olsen, Rikke Heidemann, Bisgaard, M., Christensen, Jens Peter, Kabell, S. & Christensen, Henrik, Mar 2016, In: Avian Diseases. 60, 1, p. 1-7 7 p.

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

  16. Published

    Multilocus sequence typing of Enterococcus faecalis isolates demonstrating different lesion types in broiler breeders

    Olsen, Rikke Heidemann, Petersen, A., Christensen, Henrik & Bisgaard, M., 2010, In: Avian Pathology. 39, 6, p. 435-440 6 p.

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

  17. Published

    Multi-locus sequence typing and plasmid profile characterization of avian pathogenic Escherichia coli associated with increased mortality in free-range layer flocks

    Olsen, Rikke Heidemann, Stockholm, N. M., Permin, A., Christensen, Jens Peter, Christensen, Henrik & Bisgaard, M., 2011, In: Avian Pathology. 40, 5, p. 437-444 8 p.

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

  18. Published

    Molecular characterization of APEC - a precondition for proper understanding and handling of outbreaks

    Olsen, Rikke Heidemann, Bojesen, Anders Miki, Christensen, Henrik & Bisgaard, M., 2009, Proceedings of the 5th WPSA International Symposium on Turkey Production, Berlin, Germany, 2009. Mensch und Buch Verlag, p. 277-285 9 p.

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

  19. Published

    MLST and MLSA of Enterococcus faecalis isolates demonstrating different lesion types in broiler parents

    Bisgaard, M., Petersen, A., Olsen, Rikke Heidemann & Christensen, Henrik, 2009. 1 p.

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

  20. Published

    Longitudinal study on background lesions in broiler breeder flocks and their progeny, and genomic characterisation of Escherichia coli

    Kromann, Sofie, Baig, S., Stegger, M., Olsen, Rikke Heidemann, Bojesen, Anders Miki, Jensen, Henrik Elvang & Thoefner, Ida , 2022, In: Veterinary Research. 53, 52.

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

  21. Published

    Longitudinal study of transmission of Escherichia coli from broiler breeders to broilers

    Poulsen, Louise Ladefoged, Thoefner, Ida , Bisgaard, M., Christensen, Jens Peter, Olsen, Rikke Heidemann & Christensen, Henrik, 2017, In: Veterinary Microbiology. 207, p. 13-18

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

  22. Published

    Longitudinal study of mortality observed in four broiler breeder flocks

    Thoefner, Ida , Poulsen, Louise Ladefoged, Bisgaard, M., Christensen, Henrik, Olsen, Rikke Heidemann & Christensen, Jens Peter, Sep 2015, 19th World Veterinary Poultry Association Congress. Cape Town, p. 148-148 1 p.

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

  23. Published

    Longitudinal Study on Causes of Mortality in Danish Broiler Breeders

    Thoefner, Ida , Poulsen, Louise Ladefoged, Bisgaard, M., Christensen, Henrik, Olsen, Rikke Heidemann & Christensen, Jens Peter, 2019, In: Avian Diseases. 63, 3, 400-410.

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

  24. Published

    Investigations of the pathogenesis of Staphylococcus aureus and Enterococcus faecalis in an experimental footpad infection model in broiler breeders

    Thoefner, Ida , Olsen, Rikke Heidemann, Poulsen, Louise Ladefoged, Christensen, Henrik, Bisgaard, M. & Christensen, Jens Peter, Oct 2016, Vetpath 2016 conference abstracts. Prato, p. 5-5 1 p.

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

  25. 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

  26. Published

    Insight Into the Anti-staphylococcal Activity of JBC 1847 at Sub-Inhibitory Concentration

    Ronco, T., Kappel, L. H., Aragao, M. F., Biagi, N., Svenningsen, Søren Wedel, Christensen, Jørn Bolstad, Permin, A., Saaby, Lasse, Holmstrøm, K., Klitgaard, J. K., Sabat, A. J., Akkerboom, V., Monaco, M., Tinelli, M., Friedrich, A. W., Jana, B. & Olsen, Rikke Heidemann, 2022, In: Frontiers in Microbiology. 12, 786173.

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

  27. Published

    Inhibition of Plasmid Conjugation in Escherichia coli by Targeting rbsB Gene Using CRISPRi System

    Xiao, Y., Zhang, Y., Xie, F., Olsen, Rikke Heidemann, Shi, L. & Li, L., 2023, In: International Journal of Molecular Sciences. 24, 13, 10585.

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

  28. Published

    Infections with Gram positive cocci in broiler breeders: significance and prevalence

    Thoefner, Ida , Poulsen, Louise Ladefoged, Olsen, Rikke Heidemann, Christensen, Henrik, Bisgaard, M. & Christensen, Jens Peter, Jun 2016, 16th International Conference on Production Diseases in Farm Animals: Book of abstracts. Wageningen, Netherlands: Wageningen Academic Publishers, p. 141-141 1 p.

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

  29. Published

    In vitro synergy of sertraline and tetracycline cannot be reproduced in pigs orally challenged with a tetracycline resistant Escherichia coli

    Kromann, Sofie, Hvidtfeldt, A., Boye, M., Sørensen, Dorte Bratbo, Jørgensen, S., Nielsen, Jens Peter & Olsen, Rikke Heidemann, 2019, In: BMC Microbiology. 19, 1, 12 p., 12.

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

  30. Published

    Improved understanding of diseases asssociated with potential bacterial pathogens of poultry to be gained from multilocus sequence typing (MLST)

    Bisgaard, M., Olsen, Rikke Heidemann & Christensen, Henrik, 2010, European Poultry Conference. 4 p.

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

  31. Published

    Impact of egg disinfection of hatching eggs on the eggshell microbiome and bacterial load

    Olsen, Rikke Heidemann, Kudirkiene, E., Thoefner, Ida , Pors, S., Karlskov-Mortensen, Peter, Li, L., Papasolomontos, S., Angastiniotou, C. & Christensen, Jens Peter, Nov 2017, In: Poultry Science. 96, 11, p. 3901-3911

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

  32. Published

    Impact of Nobilis Escherichia coli inac vaccine on parent stock mortality, first week mortality of broilers, and population diversity of E. coli in vaccinated flocks

    Olsen, Rikke Heidemann, Christensen, Henrik & Bisgaard, M., 2009. 1 p.

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

  33. Published

    Impact of Escherichia coli vaccine on parent stock mortality, first week mortality of broilers and population diversity of E. coli in vaccinated flocks

    Olsen, Rikke Heidemann, Christensen, Henrik, Ewers, C. & Bisgaard, M., 2010, In: Avian Pathology. 39, 4, p. 287-295 9 p.

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

  34. Published

    Hvordan opstår og udvikler bakterielle infektioner sig i store fjerkræflokke

    Christensen, Henrik, Olsen, Rikke Heidemann, Pires dos Santos, T. M. S. & Bisgaard, M., 2013, In: Dansk Erhvervsfjerkrae. 42, 4, p. 216-221 6 p.

    Research output: Contribution to journal › Journal article › Research

  35. Published

    GtxA is a virulence factor that promotes a Th2-like response during Gallibacterium anatis infection in laying hens

    Tang, B., Pors, S. E., Kristensen, B. M., Skjerning, R. B. J., Olsen, Rikke Heidemann & Bojesen, Anders Miki, 2020, In: Veterinary Research. 51, 1, 12 p., 40.

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

  36. Published

    Genomic Characterization of mcr-1-Carrying Foodborne Salmonella enterica serovar Typhimurium and Identification of a Transferable Plasmid Carrying mcr-1, blaCTX-M-14, qnrS2, and oqxAB Genes From Ready-to-Eat Pork Product in China

    Li, L., Wan, X., Olsen, Rikke Heidemann, Xiao, J., Wang, C., Xu, X., Meng, H. & Shi, L., 2022, In: Frontiers in Microbiology. 13, 903268.

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

  37. Published

    Genetic diversity of Escherichia coli associated with increased mortality in free-range layers concurrently infected with Histomonas meleagridis as demonstrated by plasmid profiling and multilocus sequence typing (MLST)

    Olsen, Rikke Heidemann, Stockholm, N. M., Permin, A., Christensen, Jens Peter, Christensen, Henrik & Bisgaard, M., 2011, 17th World Veterinary Poultry Congress: proceedings. WVPA, p. 754-756 3 p.

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

  38. Published

    Genetic context of blaCTX–M–55 and qnrS1 genes in a foodborne Salmonella enterica serotype Saintpaul isolate from China

    Li, L., Olsen, Rikke Heidemann, Xiao, J., Meng, H., Peng, S. & Shi, L., 2022, In: Frontiers in Microbiology. 13, 899062.

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

  39. Published

    First report of two foodborne Salmonella enterica subsp. enterica serovar Bovismorbificans isolates carrying a novel mega-plasmid harboring blaDHA-1 and qnrB4 genes

    Li, L., Olsen, Rikke Heidemann, Wang, C., Song, A., Xiao, J., Meng, H., Ronco, T. & Shi, L., 2021, In: International Journal of Food Microbiology. 360, 109439.

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

  40. Published

    First Report of a Foodborne Salmonella enterica Serovar Gloucester (4:i:l,w) ST34 Strain Harboring blaCTX–M–55 and qnrS Genes Located in IS26-Mediated Composite Transposon

    Li, L., Olsen, Rikke Heidemann, Song, A., Xiao, J., Wang, C., Meng, H. & Shi, L., 2021, In: Frontiers in Microbiology. 12, 646101.

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

  41. Published

    Extended-spectrum β-lactamase-producing Escherichia coli isolated from poultry: a review of current problems, illustrated with some laboratory findings

    Olsen, Rikke Heidemann, Bisgaard, M., Löhren, U., Robineau, B. & Christensen, Henrik, 2014, In: Avian Pathology. 43, 3, p. 199-208 10 p.

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

  42. Published

    Exploring the resistome, virulome, mobilome and microbiome along pork production chain using metagenomics

    Li, L., Xiao, Y., Wang, C., Olsen, Rikke Heidemann, Meng, H. & Shi, L., 2022, In: International Journal of Food Microbiology. 371, 109674.

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

  43. Published

    Experimental induced avian E. coli salpingitis: significant impact of strain and host factors on the clinical and pathological outcome

    Olsen, Rikke Heidemann, Thoefner, Ida , Pors, S. E., Pires dos Santos, T. M. S. & Christensen, Jens Peter, 2016, In: Veterinary Microbiology. 188, p. 59-66 8 p.

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

  44. Published

    Evaluation of the efficacy of an autogenous Escherichia coli vaccine in broiler breeders

    Li, L., Thoefner, Ida , Christensen, Jens Peter, Ronco, T., Pedersen, K. & Olsen, Rikke Heidemann, Jun 2017, In: Avian pathology : journal of the W.V.P.A. 46, 3, p. 300-308 9 p.

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

  45. Published

    Establishment and application of an aerogenous model of avian colibacillosis

    Kromann, Sofie, Olsen, Rikke Heidemann, Bojesen, Anders Miki, Thoefner, Ida & Jensen, Henrik Elvang, 2023.

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

  46. Published

    Escherichia coli in industrial poultry production: aspects of transmission and disease development

    Christensen, Jens Peter, Pors, S. E., Papasolomontos, S., Poulsen, Louise Ladefoged, Thoefner, Ida , Olsen, Rikke Heidemann, Christensen, Henrik & Bisgaard, M., Jun 2016, 16th International Conference on Production Diseases in Farm Animals: Book of abstracts. Wageningen Academic Publishers, p. 140 1 p.

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

  47. Published

    Escherichia coli associeret sygdom i konsumægsektoren. Kortlægning af faktorer af betydning for sygdomsudviking og sygdomsforebyggelse

    Bisgaard, M., Olsen, Rikke Heidemann, Kyvsgaard, N. C., Christensen, Jens Peter & Christensen, Henrik, 2011, In: Dansk Erhvervsfjerkrae. 39, p. 130-133 4 p.

    Research output: Contribution to journal › Journal article › Communication

  48. Published

    Epidemiological Prevalence of Phenotypical Resistances and Mobilised Colistin Resistance in Avian Commensal and Pathogenic E. coli from Denmark, France, The Netherlands, and the UK

    Mead, A., Billon-Lotz, C., Olsen, Rikke Heidemann, Swift, B., Richez, P., Stabler, R. & Pelligand, L., 2022, In: Antibiotics. 11, 5, 631.

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

  49. Published

    Engineering a CRISPR interference system targeting AcrAB-TolC efflux pump to prevent multidrug resistance development in Escherichia coli

    Wan, X., Li, Q., Olsen, Rikke Heidemann, Meng, H., Zhang, Z., Wang, J., Zheng, H., Li, L. & Shi, L., 2022, In: The Journal of antimicrobial chemotherapy. 77, 8, p. 2158-2166 9 p.

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

  50. Published

    Efflux Pumps and Different Genetic Contexts of tet(X4) Contribute to High Tigecycline Resistance in Escherichia fergusonii from Pigs

    Wang, J., Wan, X., Meng, H., Olsen, Rikke Heidemann, Chen, X. & Li, L., 2023, In: International Journal of Molecular Sciences. 24, 8, 10 p., 6923.

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

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