Rikke Heidemann Olsen

2019

Correlation between footpad lesions and systemic bacterial infections in broiler breeders

Thøfner, I. C. N., Poulsen, L. L., Bisgaard, M., Christensen, H., Olsen, R. H. & Christensen, J. P., 22 May 2019, In: Veterinary Research. 50, 1, 5 p., 38.

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

6 Citations (Scopus)

16 Downloads (Pure)

Diversity and population overlap between avian and human Escherichia coli belonging to sequence type 95

Jørgensen, S. L., Stegger, M., Kudirkiene, E., Lilje, B., Poulsen, L. L., Ronco, T., Dos Santos, T. P., Kiil, K., Bisgaard, M., Pedersen, K., Nolan, L. K., Price, L. B., Olsen, R. H., Andersen, P. S. & Christensen, H., 2019, In: mSphere. 4, 1, 12 p., e00333-18.

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

19 Citations (Scopus)

38 Downloads (Pure)

Draft genome sequences of three human pathogenic acinetobacter baumannii strains

Madhi, M., Ronco, T., Hasani, A. & Olsen, R. H., 2019, In: Microbiology Resource Announcements. 8, 14, 2 p., e01742-18.

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

9 Downloads (Pure)

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

Kromann, S., Hvidtfeldt, A., Boye, M., Sørensen, D. B., Jørgensen, S., Nielsen, J. P. & Olsen, R. H., 2019, In: BMC Microbiology. 19, 1, 12 p., 12.

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

32 Downloads (Pure)

Longitudinal Study on Causes of Mortality in Danish Broiler Breeders

Thoefner, I., Poulsen, L. L., Bisgaard, M., Christensen, H., Olsen, R. H. & Christensen, J. P., Sept 2019, In: Avian Diseases. 63, 3, 400-410.

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

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, R. H., Hess, C., Aalbæk, B., Olsen, J. E. & Christensen, H., 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

2018

Characterization of prevalent bacterial pathogens associated with pododermatitis in table egg layers

Heidemann Olsen, R., Christensen, H., Kabell, S. & Bisgaard, M., 4 May 2018, In: Avian Pathology. 47, 3, p. 281-285 5 p.

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

9 Citations (Scopus)

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

Wang, C., Pors, S. E., Olsen, R. H. & Bojesen, A. M., 2018, In: Veterinary Microbiology. 217, p. 76-81 6 p.

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

10 Citations (Scopus)

2017

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

Jørgensen, S. L., Kudirkiene, E., Li, L., Christensen, J. P., Olsen, J. E., Nolan, L. K. & Olsen, R. H., 10 May 2017, In: Standards in Genomic Sciences. 12, 9 p., 33.

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

4 Citations (Scopus)

81 Downloads (Pure)

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

Li, L., Thøfner, I., Christensen, J. P., Ronco, T., Pedersen, K. & Olsen, R. H., 4 May 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

10 Citations (Scopus)

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

Olsen, R., Kudirkiene, E., Thofner, I., Pors, S., Karlskov-Mortensen, P., Li, L., Papasolomontos, S., Angastiniotou, C. & Christensen, J., Nov 2017, In: Poultry Science. 96, 11, p. 3901-3911

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

9 Citations (Scopus)

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

Li, L., Kromann, S., Olsen, J. E., Svenningsen, S. W. & Olsen, R. H., 2017, In: Journal of Antibiotics. 70, 9, p. 944-953 10 p.

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

12 Citations (Scopus)

66 Downloads (Pure)

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

Poulsen, L. L., Thoefner, I., Bisgaard, M., Christensen, J. P., Olsen, R. H. & Christensen, H., Aug 2017, In: Veterinary Microbiology. 207, p. 13-18

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

22 Citations (Scopus)

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

Ronco, T., Stegger, M., Olsen, R. H., 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

29 Citations (Scopus)

144 Downloads (Pure)

Staphylococcus agnetis, a potential pathogen in broiler breeders

Poulsen, L. L., Thøfner, I., Bisgaard, M., Olsen, R. H., Christensen, J. P. & Christensen, H., 2017, In: Veterinary Microbiology. 212, p. 1-6 6 p.

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

10 Citations (Scopus)

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

Kromann, S., Kudirkiene, E., Li, L., Thoefner, I., Daldorph, E., Christensen, J. P., Meng, H. & Olsen, R. H., 2017, In: PLoS ONE. 12, 10, 15 p., e0185914.

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

3 Citations (Scopus)

70 Downloads (Pure)

2016

Antimicrobial Resistance and Resistance Genes in Aerobic Bacteria Isolated from Pork at Slaughter

Li, L., Olsen, R. H., Ye, L., Yan, H., Nie, Q., Meng, H. & Shi, L., Apr 2016, In: Journal of Food Protection. 79, 4, p. 589-597 9 p.

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

7 Citations (Scopus)

Beskytter E. coli autovacciner mod æggeleder- og bughindebetændelse under eksperimentelle forhold?

Thøfner, I., Ronco, T., Christensen, J. P., Pedersen, K. & Olsen, R. H., 2016, In: Dansk Erhvervsfjerkrae. 45, 11, p. 42-45

Research output: Contribution to journal › Journal article › Research

Characterization of Antimicrobial Resistance of Listeria monocytogenes Strains Isolated from a Pork Processing Plant and Its Respective Meat Markets in Southern China

Li, L., Olsen, R. H., Ye, L., Wang, W., Shi, L., Yan, H. & Meng, H., May 2016, In: Foodborne pathogens and disease. 13, 5, p. 262-668 7 p.

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

12 Citations (Scopus)

Characterization of a plasmid carrying cat, ermB and tetS genes in a foodborne Listeria monocytogenes strain and uptake of the plasmid by cariogenic Streptococcus mutans

Li, L., Olsen, R. H., Shi, L., Ye, L., He, J. & Meng, H., 5 Dec 2016, In: International Journal of Food Microbiology. 238, p. 68-71 4 p.

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

8 Citations (Scopus)

Draft Genome Sequences of Two Avian Pathogenic Escherichia coli Strains of Clinical Importance, E44 and E51

Ronco, T., Stegger, M., Andersen, P. S., Pedersen, K., Li, L., Thøfner, I. C. N. & Olsen, R. H., 2016, In: Genome Announcements. 4, 4, 2 p., e00768-16.

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

4 Citations (Scopus)

55 Downloads (Pure)

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

Christensen, J. P., Pors, S. E., Papasolomontos, S., Poulsen, L. L., Thøfner, I., Olsen, R. H., Christensen, H. & 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

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

Olsen, R. H., Thøfner, I., Pors, S. E., Pires dos Santos, T. M. S. & Christensen, J. P., 30 May 2016, In: Veterinary Microbiology. 188, p. 59-66 8 p.

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

12 Citations (Scopus)

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

Thøfner, I., Poulsen, L. L., Olsen, R. H., Christensen, H., Bisgaard, M. & Christensen, J. P., 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

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

Thoefner, I., Olsen, R. H., Poulsen, L. L., Christensen, H., Bisgaard, M. & Christensen, J. P., 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

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

Olsen, R. H., Bisgaard, M., Christensen, J. P., Kabell, S. & Christensen, H., Mar 2016, In: Avian Diseases. 60, 1, p. 1-7 7 p.

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

10 Citations (Scopus)

2015

Draft genome sequences of five clinical Enterococcus cecorum strains isolated from different poultry species in Poland

Dolka, B., Olsen, R. H., Thøfner, I. & Christensen, J. P., 2015, In: Genome Announcements. 3, 5, 2 p., e01085-15.

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

1 Citation (Scopus)

94 Downloads (Pure)

Draft genome sequences of three Escherichia coli strains with different In Vivo pathogenicities in an avian (Ascending) infection model of the oviduct

Olsen, R. H., Thøfner, I., Pors, S. E., Christensen, H., Bisgaard, M. & Christensen, J. P., 2015, In: Genome Announcements. 3, 3, 2 p., e00399-15 .

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

2 Citations (Scopus)

51 Downloads (Pure)

Draft genome sequences of two commensal Enterococcus cecorum strains isolated from chickens in Belgium

Dolka, B., Boyen, F., Butaye, P., Olsen, R. H., Thøfner, I. & Christensen, J. P., 24 Sept 2015, In: Genome Announcements. 3, 5, 2 p., e01108-15.

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

2 Citations (Scopus)

85 Downloads (Pure)

Longitudinal study of mortality observed in four broiler breeder flocks

Thøfner, I., Poulsen, L. L., Bisgaard, M., Christensen, H., Olsen, R. H. & Christensen, J. P., Sept 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

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

Thøfner, I., Poulsen, L. L., Bisgaard, M., Christensen, H., Olsen, R. H. & Christensen, J. P., Sept 2015.

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

2014

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

Olsen, R. H., Bisgaard, M., Löhren, U., Robineau, B. & Christensen, H., May 2014, In: Avian Pathology. 43, 3, p. 199-208 10 p.

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

41 Citations (Scopus)

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

Pors, S. E., Olsen, R. H. & Christensen, J. P., 2014, In: Veterinary Microbiology. 170, 3-4, p. 368-374 7 p.

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

16 Citations (Scopus)

2013

Hvordan opstår og udvikler bakterielle infektioner sig i store fjerkræflokke

Christensen, H., Olsen, R. H., 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

In vitro and in vivo investigation on genomic stability of Salmonella enterica Typhimurium DT41 obtained from broiler breeders in Denmark

Barua, H., Lindblom, I. L., Bisgaard, M., Christensen, J. P., Olsen, R. H. & Christensen, H., 25 Oct 2013, In: Veterinary Microbiology. 166, 3-4, p. 607-616 10 p.

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

9 Citations (Scopus)

2012

An investigation on first-week mortality in layers

Olsen, R. H., Frantzen, C., Christensen, H. & Bisgaard, M., Mar 2012, In: Avian Diseases. 56, 1, p. 51-57 7 p.

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

37 Citations (Scopus)

Comparative genomics of multiple plasmids from APEC associated with clonal outbreaks demonstrates major similarities and identifies several potential vaccine-targets.

Olsen, R. H., Christensen, H. & Bisgaard, M., 17 Aug 2012, In: Veterinary Microbiology. 158, 3-4, p. 384-393 10 p.

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

21 Citations (Scopus)

Enterococcus faecalis of human and poultry origin share virulence genes supporting the zoonotic potential of E. faecalis

Olsen, R. H., Schønheyder, H. C., Christensen, H. & Bisgaard, M., Jun 2012, In: Zoonoses and Public Health. 59, 4, p. 256-263 8 p.

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

30 Citations (Scopus)

Population diversity and impact of Enterococcus faecalis in chickens

Olsen, R. H., 2012, Department of Veterinary Disease Biology, University of Copenhagen. 125 p.

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

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

Olsen, R. H., Christensen, H. & Bisgaard, M., 9 Nov 2012, In: Veterinary Microbiology. 160, 1-2, p. 214-221 8 p.

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

8 Citations (Scopus)

2011

Characterization of diversity and virulence traits of Escherichia coli associated with haemorrhagic septicaemia outbreaks in turkeys

Olsen, R. H., Chadfield, M. S., Christensen, J. P., Scheutz, F., Christensen, H. & Bisgaard, M., 2011, 17th World Veterinary Poultry Congress: proceedings. WVPA, p. 471-473 3 p.

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

Clonality and virulence traits of Escherichia coli associated with hemorrhagic septicaemia in turkeys

Olsen, R. H., Chadfield, M. S., Christensen, J. P., Scheutz, F., Christensen, H. & Bisgaard, M., Dec 2011, In: Avian Pathology. 40, 6, p. 587-595 9 p.

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

19 Citations (Scopus)

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

Bisgaard, M., Olsen, R. H., Kyvsgaard, N. C., Christensen, J. P. & Christensen, H., 2011, In: Dansk Erhvervsfjerkrae. 39, p. 130-133 4 p.

Research output: Contribution to journal › Journal article › Communication

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, R. H., Stockholm, N. M., Permin, A., Christensen, J. P., Christensen, H. & 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

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

Olsen, R. H., Stockholm, N. M., Permin, A., Christensen, J. P., Christensen, H. & Bisgaard, M., Oct 2011, In: Avian Pathology. 40, 5, p. 437-444 8 p.

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

16 Citations (Scopus)

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

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

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

12 Citations (Scopus)

561 Downloads (Pure)

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

Olsen, R. H., Schønheyder, H-C., Christensen, H. & 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

2010

Characterization of pasteurellaceae-like bacteria isolated from clinically affected psittacine birds

Gregersen, R. H., Neubauer, C., Christensen, H., Korczak, B., Bojesen, A. M., Hess, M. & Bisgaard, M., Apr 2010, In: Journal of Applied Microbiology. 108, 4, p. 1235-1243 9 p.

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

10 Citations (Scopus)

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

Olsen, R. H., Christensen, H., 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

22 Citations (Scopus)

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

Bisgaard, M., Olsen, R. H. & Christensen, H., 2010, European Poultry Conference. 4 p.

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

Rikke Heidemann Olsen

Research output

Search results