John Elmerdahl Olsen

2008

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, J. E., 2008, In: International Journal of Antimicrobial Agents. 32, 4, p. 367-369 3 p.

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

33 Citations (Scopus)

Survival of Salmonella and physiological response to cold storage of beef

Aabo, S., Knudsen, G. M. & Olsen, J. E., 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

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

Rosenkrantz, J. T., Olsen, J. E., 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

2007

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, H., Bisgaard, M. & Olsen, J. E., 2007, In: BMC Evolutionary Biology. 7, 184, 11 p.

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

5 Citations (Scopus)

395 Downloads (Pure)

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, H. & Olsen, J. E., 2007, Ikke angivet. ASM, 1 p.

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

Effects of crp deletion in Salmonella enterica serotype Gallinarum

Rosu, V., Chadfield, M. S., Santona, A., Christensen, J. P., Thomsen, L. E., Rubino, S. & Olsen, J. E., 2007, In: Acta Veterinaria Scandinavica (Print Edition). 49, 14, 7 p.

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

25 Citations (Scopus)

341 Downloads (Pure)

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

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

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

11 Citations (Scopus)

Fødevaremikrobiologi

Translated title of the contribution: Food microbiologyLarsen, M. H., Ingmer, H. & Olsen, J. E., 2007, LMC årsberetning 2006. Levnedsmiddelcentret, p. 22 1 p.

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

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, J. E., 2007, In: Kenya Veterinarian. 31, 1, p. 6-11 6 p.

Research output: Contribution to journal › Journal article › Research

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, J. E., 2007, In: Avian Diseases. 51, 2, p. 534-539 6 p.

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

3 Citations (Scopus)

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, J. E., 2007, In: Kenya Veterinarian. 31, 1, p. 1-5 5 p.

Research output: Contribution to journal › Journal article › Research

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. EP., Porsbo, L. J., Emborg, H-D., Olsen, J. E. & 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

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

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

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

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

Bojesen, A. M., Vazquez, M. E., Robles, F., Gonzalez, C., Soriano, E., Olsen, J. E. & Christensen, H., 2007, In: Veterinary Microbiology. 123, 1-3, p. 262-268 7 p.

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

30 Citations (Scopus)

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, J. E., 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

Virulence characterization of Avibacterium paragallinarum isolates from Uganda

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

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

12 Citations (Scopus)

2006

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

Christensen, H., Hommez, J., Olsen, J. E. & 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

5 Citations (Scopus)

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, J. E., 2006, In: Avian Pathology. 35, 4, p. 270-276 7 p.

Research output: Contribution to journal › Journal article › Research

12 Citations (Scopus)

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

Olsen, J. E., Christensen, H. & 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

101 Citations (Scopus)

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, J. E., 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

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

Porro, M. T., Olsen, J. E., Jakobsen, L. & Hammerum, A. M., 2006. 1 p.

Research output: Contribution to conference › Poster › Research

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

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

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

24 Citations (Scopus)

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, J. E., 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

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

Poulsen, L. L., Reinert, T. M., Sand, R. L., Bisgaard, M., Christensen, H., Olsen, J. E., Stuen, S. & Bojesen, A. M., 2006, In: Acta Veterinaria Scandinavica (Print Edition). 48, 19, 7 p.

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

16 Citations (Scopus)

Salmonella infections: 3

Mølbak, K., Olsen, J. E. & 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

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

Knudsen, G. M., Thomsen, L. E., Aabo, S. & Olsen, J. E., 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

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

Christensen, J. P., Chadfield, M. S., Olsen, J. E. & 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

1 Citation (Scopus)

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, J. E. & Ingmer, H., 2006, In: Molecular Microbiology. 61, 6, p. 1622–1635 14 p.

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

49 Citations (Scopus)

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

Vieira, A. R. P., Emborg, H-D., Wong, D. L. F., Jensen, L. B., Aarestrup, F. M., Wegener, H. C., Dalsgaard, A., Olsen, J. E., Ersbøll, A. K., Houe, H., Guardabassi, L., 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

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, J. E. & 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

15 Citations (Scopus)

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

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

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

59 Citations (Scopus)

2005

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, J. E., 2005, In: Kenya Veterinarian. 29, p. 113-118 4 p.

Research output: Contribution to journal › Journal article › Research

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

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

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

18 Citations (Scopus)

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

Christensen, H., Bisgaard, M., Fink, M. & Olsen, J. E., 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

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, J. E., 2005, In: Kenya Veterinarian. 29, p. 53-56 4 p.

Research output: Contribution to journal › Journal article › Research

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, J. E., 2005, In: Kenya Veterinarian. 29, p. 45-47 3 p.

Research output: Contribution to journal › Journal article › Research

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, J. E. & Skadhauge, E., 2005, In: Comparative Biochemistry and Physiology. 141, p. 476-484 9 p.

Research output: Contribution to journal › Journal article › Research

6 Citations (Scopus)

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

Christensen, H., Kuhnert, P., Bisgaard, M., Mutters, R., Dziva, F. & Olsen, J. E., 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

14 Citations (Scopus)

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

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

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

22 Citations (Scopus)

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

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

Research output: Book/Report › Doctoral thesis

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, J. E., 2005, In: Preventive Veterinary Medicine. 69, 3-4, p. 213-228 16 p.

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

36 Citations (Scopus)

Taxonomy of Pasteurellaceae: an update B18

Christensen, H., Kubnert, P., Olsen, J. E. & 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

John Elmerdahl Olsen

Research output

Search results