John Elmerdahl Olsen

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• 2022

  “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, J. E. & Herrero-Fresno, A., 2022, In: Frontiers in Cellular and Infection Microbiology. 12, 824039.

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  12 Citations (Scopus)

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• 2021

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

  Jibril, A. H., Okeke, I. N., Dalsgaard, A. & Olsen, J. E., 2021, In: BMC Veterinary Research. 17, 234.

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  33 Citations (Scopus)

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• 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, J. E., Dalsgaard, A. & Ding, Z., 2021, In: Science of the Total Environment. 792, 148259.

  Research output: Contribution to journal › Journal article › Research › peer-review
  30 Citations (Scopus)

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

  Fei, X., Li, Q., Olsen, J. E. & Jiao, X., 2021, In: Frontiers in Microbiology. 12, 698322.

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  1 Citation (Scopus)

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• 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, Y. M. G., Bortolaia, V., Dang, S. T. T., Truong, D., Olsen, J. E. & Dalsgaard, A., 2021, In: Frontiers in Microbiology. 12, 14 p., 629139.

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  26 Citations (Scopus)

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

  Truong, D. T. Q., Hounmanou, Y. M. G., Dang, S. T. T., Olsen, J. E., Truong, G. T. H., Tran, N. T., Scheutz, F. & Dalsgaard, A., 2021, In: Antibiotics. 10, 10, 1165.

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  15 Citations (Scopus)

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• 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, J. E. & Herrero-Fresno, A., 2021, In: Microbial Genomics. 7, 12, 22 p., :000719.

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  20 Citations (Scopus)

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

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

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  30 Citations (Scopus)

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

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

  Research output: Contribution to journal › Journal article › Research › peer-review
  4 Citations (Scopus)

• 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, J. E. & Junior, A. B., 2021, In: Brazilian Journal of Microbiology. 52, p. 419–429

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  2 Citations (Scopus)

• 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, J. E., 2021, In: Veterinary Microbiology. 259, 109135.

  Research output: Contribution to journal › Journal article › Research › peer-review
  26 Citations (Scopus)

• 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., Agerlin, M. V., Weber, N. R., Nødtvedt, A., Nielsen, J. P., Hartmann, K. T., Skade, L., Larsen, L. E., Pankoke, K., Olsen, J. E., Jensen, H. E. & Pedersen, K. S., 2021, In: Porcine Health Management. 7, 54.

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  41 Citations (Scopus)

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

  Eriksen, E. Ø., Kudirkiene, E., Nielsen, J. P., Olsen, J. E. & Pedersen, K. S., 2021.

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

• Prediction of Mannheimia haemolytica serotypes based on whole genomic sequences

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

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  7 Citations (Scopus)

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• 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, K. S., Nielsen, J. P. & Olsen, J. E., 2021, In: Antibiotics. 10, 4, 465.

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  6 Citations (Scopus)

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• 2020

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

  Fei, X., Li, Q., Olsen, J. E. & Jiao, X., 2020, In: Infection, Genetics and Evolution. 85, 104446.

  Research output: Contribution to journal › Journal article › Research › peer-review
  8 Citations (Scopus)

• 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, J. E., Hensel, M. & Rodicio, M. R., 2020, In: Microorganisms. 8, 5, 15 p., 630.

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

  Spiegelhauer, M. R., García, V., Guerra, P. R., Olsen, J. E. & Herrero-Fresno, A., 2020, In: Pathogens and Disease. 78, 3, ftaa019.

  Research output: Contribution to journal › Journal article › Research › peer-review
  4 Citations (Scopus)

• 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, L. V., Kudirkiene, E., Rattenborg, E., Sørensen, G., Denwood, M. J., Olsen, J. E. & Nielsen, L. R., 2020, In: Preventive Veterinary Medicine. 181, 104531 p.

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  7 Citations (Scopus)

• 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, S. & Olsen, J. E., 2020, In: Frontiers in Cellular and Infection Microbiology. 9, 12 p., 420.

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  24 Citations (Scopus)

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

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

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  2 Citations (Scopus)

• 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, L. V., Nielsen, L. R., Rattenborg, E., Ahmed, S. & Olsen, J. E., 2020, In: Applied and Environmental Microbiology. 86, 3, 12 p., e01894-19.

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  28 Citations (Scopus)

• 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, L. E. & Olsen, J. E., 2020, In: Veterinary Journal. 256, 105425.

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  32 Citations (Scopus)

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

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

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  39 Citations (Scopus)

• 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, L., Poolman, M. G. & Olsen, J. E., 2020, In: Scientific Reports. 10, 1, 13 p., 8438.

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  9 Citations (Scopus)

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• 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, J. E., 2020, In: Scientific Reports. 10, 13 p., 18637.

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  39 Citations (Scopus)

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

  Lhermie, G., La Ragione, R. M., Weese, J. S., Olsen, J. E., Christensen, J. P. & Guardabassi, L., 2020, In: The Journal of antimicrobial chemotherapy. 75, 7, p. 1671-1680 10 p.

  Research output: Contribution to journal › Journal article › Research › peer-review
  29 Citations (Scopus)

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

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

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  6 Citations (Scopus)

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

  Hounmanou, Y. M. G., Dalsgaard, A., Sopacua, T. F., Uddin, G. M. N., Leekitcharoenphon, P., Hendriksen, R. S., Olsen, J. E. & Larsen, M. H., 2020, In: Frontiers in Microbiology. 11, 1985.

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  19 Citations (Scopus)

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

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

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  7 Citations (Scopus)

• Prevalence and genomic characterization of Salmonella Weltevreden in commercial pig feed

  Minh, D. K., Hounmanou, Y. M. G., Mai, H. B. T., Olsen, J. E. & Dalsgaard, A., 2020, In: Veterinary Microbiology. 246, 108725.

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  18 Citations (Scopus)

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

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

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  46 Citations (Scopus)

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• 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, J. E., Tran, N. T., Truong, G. T. H., Vu, H. T. K. & Dalsgaard, A., 2020, In: FEMS Microbes. 1, 1, 6 p., xtaa003.

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  9 Citations (Scopus)

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• 2019

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

  Liu, G., Bogaj, K., Bortolaia, V., Olsen, J. E. & Thomsen, L. E., 2019, In: Frontiers in Microbiology. 10, 2119.

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  54 Citations (Scopus)

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• Cholera hotspots and surveillance constraints contributing to recurrent epidemics in Tanzania

  Hounmanou, Y. M. G., Mølbak, K., Kähler, J., Mdegela, R. H., Olsen, J. E. & Dalsgaard, A., 2019, In: BMC Research Notes. 12, 6 p., 664.

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  8 Citations (Scopus)

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• Corrigendum: Surveillance and Genomics of Toxigenic Vibrio cholerae O1 From Fish, Phytoplankton and Water in Lake Victoria, Tanzania (Frontiers in Microbiology, (2019), 10, (901), 10.3389/fmicb.2019.00901)

  Hounmanou, Y. M. G., Leekitcharoenphon, P., Hendriksen, R. S., Dougnon, T. V., Mdegela, R. H., Olsen, J. E. & Dalsgaard, A., 20 Dec 2019, In: Frontiers in Microbiology. 10, 2974.

  Research output: Contribution to journal › Comment/debate › Research › peer-review

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  4 Citations (Scopus)

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

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

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  20 Citations (Scopus)

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

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

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  14 Citations (Scopus)

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

  Hounmanou, Y. M. G., Leekitcharoenphon, P., Kudirkiene, E., Mdegela, R. H., Hendriksen, R. S., Olsen, J. E. & Dalsgaard, A., 2019, In: PLOS Neglected Tropical Diseases . 13, 12, 14 p., e0007934.

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  18 Citations (Scopus)

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

  Liu, G., Olsen, J. E. & Thomsen, L. E., 2019, In: Frontiers in Microbiology. 10, 9 p., 2203.

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  13 Citations (Scopus)

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

  Mortensen, S., Johansen, A. E., Thøfner, I., Christensen, J. P., Pors, S. E., Fresno, A. H., Møller-Jensen, J. & Olsen, J. E., 2019, In: Veterinary Microbiology. 239, 108445.

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  10 Citations (Scopus)

• 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., Thøfner, I., Skov, S. & Olsen, J. E., 2019, In: Infection and Immunity. 87, 12, e00552-19.

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  23 Citations (Scopus)

• 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

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

  Hounmanou, Y. M. G., Leekitcharoenphon, P., Hendriksen, R. S., Dougnon, T. V., Mdegela, R. H., Olsen, J. E. & Dalsgaard, A., 2019, In: Frontiers in Microbiology. 10, 15 p., 901.

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• 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, L. E., Christensen, J. P., Jensen, P. R. & Olsen, J. E., 2019, In: Veterinary Microbiology. 230, p. 23-31 9 p.

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

  Hounmanou, Y. M. G., Mdegela, R. H., Dougnon, T. V., Madsen, H., Withey, J. H., Olsen, J. E. & Dalsgaard, A., 2019, In: Frontiers in Microbiology. 10, 14 p., 1215.

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  14 Citations (Scopus)

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

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

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  47 Citations (Scopus)

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• 2018

  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, P., Rosenkrantz, J. T., Minga, U. M., Mtambo, M. M. A. & Olsen, J. E., 2018, In: Microbial Drug Resistance. 24, 3, p. 260-268 9 p.

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  39 Citations (Scopus)

• 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, J. E. & Fresno, A. H., Jan 2018, In: Frontiers in Microbiology. 8, 1, 11 p., 2656.

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• 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, J. E., May 2018, In: Journal of Applied Microbiology. 124, 5, p. 1303-1310 8 p.

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  11 Citations (Scopus)