John E. Olsen

Frederiksberg, Denmark

Last Updated: 09/26/2026

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Found 181 publications

Genome-wide identification of conditionally essential genes for growth in the presence of sulfamethoxazole and trimethoprim in sulfamethoxazole- and trimethoprim-resistant Escherichia coli.

Genome-wide identification of conditionally essential genes for growth in the presence of sulfamethoxazole and trimethoprim in sulfamethoxazole- and trimethoprim-resistant Escherichia coli.

Journal: Microbiology spectrum

Published: July 29, 2026

Short-chain fatty acid-producing taxa enriched by competitive exclusion cultures can drive resistance to non-typhoidal Salmonella colonization in broilers.

Short-chain fatty acid-producing taxa enriched by competitive exclusion cultures can drive resistance to non-typhoidal Salmonella colonization in broilers.

Journal: Journal of applied microbiology

Published: July 07, 2026

Profiling of genetic determinants required for fitness of community-associated methicillin-resistant Staphylococcus aureus in human blood.

Profiling of genetic determinants required for fitness of community-associated methicillin-resistant Staphylococcus aureus in human blood.

Journal: Microbiology spectrum

Published: April 21, 2026

CRISPR-Cas9 mediated adiA knockout in Hafnia paralvei: Implications for agmatine production and acid stress survival in a fermented dairy matrix.

CRISPR-Cas9 mediated adiA knockout in Hafnia paralvei: Implications for agmatine production and acid stress survival in a fermented dairy matrix.

Journal: Food microbiology

Published: April 06, 2026

Field Testing of a Virus-Particle-Based Sow Vaccine Against F4 and STb-Positive Escherichia coli.

Field Testing of a Virus-Particle-Based Sow Vaccine Against F4 and STb-Positive Escherichia coli.

Journal: Vaccines

Published: March 16, 2026

Effect of age, severity of diarrhoea, number of pathogens present and blooming of E. coli on metagenomic characteristics of stools from Danish dairy calves with diarrhoea.

Effect of age, severity of diarrhoea, number of pathogens present and blooming of E. coli on metagenomic characteristics of stools from Danish dairy calves with diarrhoea.

Journal: Veterinary microbiology

Published: March 07, 2026

Genomic architecture of fourth-generation cephalosporin-resistant Klebsiella pneumoniae Species Complex (KpSC) from patients and their hospital environment in Uganda.

Genomic architecture of fourth-generation cephalosporin-resistant Klebsiella pneumoniae Species Complex (KpSC) from patients and their hospital environment in Uganda.

Journal: BMC microbiology

Published: November 29, 2025

Origin and development of two Escherichia coli clones vertically transferred in broiler production.

Origin and development of two Escherichia coli clones vertically transferred in broiler production.

Journal: Microbial genomics

Published: November 28, 2025

The effect of hyper-induced SOS response on evolution in Escherichia coli.

The effect of hyper-induced SOS response on evolution in Escherichia coli.

Journal: BMC microbiology

Published: November 27, 2025

Characterization of Trueperella pyogenes strains from uterus of cow and an analysis of their phylogenic association with strains from other anatomic locations and hosts.

Characterization of Trueperella pyogenes strains from uterus of cow and an analysis of their phylogenic association with strains from other anatomic locations and hosts.

Journal: Veterinary microbiology

Published: November 25, 2025

Comparative pan-genomics and in vivo validation identify genetic factors important for virulence of Salmonella enterica serovar Gallinarum and serovar Enteritidis in the avian host.

Comparative pan-genomics and in vivo validation identify genetic factors important for virulence of Salmonella enterica serovar Gallinarum and serovar Enteritidis in the avian host.

Journal: Microbiological research

Published: October 12, 2025

Identification of a novel gene associated with group B Streptococcus persister cell formation and biofilm production.

Identification of a novel gene associated with group B Streptococcus persister cell formation and biofilm production.

Journal: Scientific reports

Published: August 27, 2025

Showing 1-12 of 181

Last Updated: 09/26/2026