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J

John Elmerdahl Olsen

university of copenhagen

61H-index
574Paper Count
1.4WCitation Count
Published Papers 127
Publication Date
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CRISPR-Cas9 mediated adiA knockout in Hafnia paralvei: Implications for agmatine production and acid stress survival in a fermented dairy matrix
errFood Microbiology
IF4.6
err2026-08-14
err0
errOAAI
errAngel Casado; Sandra M. Wellner; Alejandro Quirós; Ana Herrero-Fresno; John Elmerdahl Olsen; Miguel A. Alvarez; Victor Ladero
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Field Testing of a Virus-Particle-Based Sow Vaccine Against F4 and STb-Positive Escherichia coli
errVaccines
IF3.4
err2026-06-08
err0
errOAAI
errPriscila R. Guerra; Elisabeth O. Nielsen; Ikhlaq H. Kana; Søren K. Boldsen; Vanesa García; Ana Herero-Fresno; Nicole B. Goecke; Morten A. Nielsen; Adam F. Sander; John E. Olsen
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Establishment and application of a new one-step multiplex PCR for the accurate detection and differentiation of Salmonella Gallinarum biovars Pullorum and Gallinarum
errBMC Veterinary Research
IF2.6
err2026-04-09
err0
PREAI
errXiong, Dan; Yuan, Li; Fei, Xiao; Olsen, John Elmerdahl; Pan, Zhiming; Jiao, Xinan
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Characterization of Trueperella pyogenes strains from uterus of cow and an analysis of their phylogenic association with strains from other anatomic locations and hosts
errVeterinary Microbiology
IF2.7
err2026-02-01
err0
PREAI
errChristensen, Henrik; Kudirkiene, Egle; Olsen, John Elmerdahl
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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
errMicrobiological Research
IF6.9
err2026-01-19
err0
PREAI
errXiao Fei; Jennifer Moussa; Priscila Regina Guerra; Sajid Nisar; Yibing Ma; Weizhe Wang; Mauro M.S. Saraiva; Heng Li; Zhemin Zhou; John Elmerdahl Olsen
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Genome-wide identification of tissue-specific fitness genes in murine models of Staphylococcus aureus infection
erriScience
IF4.1
err2025-11-28
err0
errOAAI
errSally W. Yousief; Nader Abdelmalek; Martin S. Bojer; Yibing Ma; Priscila R. Guerra; Sajid Nisar; John E. Olsen; Bianca Paglietti
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Origin and development of two Escherichia coli clones vertically transferred in broiler production
errMICROBIAL GENOMICS
IF4
err2025-11-01
err0
PREAI
errZhao, Yufei; Heuvelink, Annet; Olsen, John Elmerdahl; Poulsen, Louise; Christensen, Henrik
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Exploring the susceptome of methicillin-resistant Staphylococcus aureus to oxacillin and cefazolin using integrated TraDIS and proteomics
errInternational Journal of Antimicrobial Agents
IF4.6
err2025-10-27
err0
PREAI
errNader Abdelmalek; Sally W. Yousief; Alessandro Tanca; Martin S. Bojer; Mosaed Saleh A. Alobaidallah; John E. Olsen; Bianca Paglietti
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Diversity of Escherichia coli from Faecal Samples of Danish Calves with Diarrhoea
errVeterinary Sciences
IF2.3
err2025-10-13
err0
errOAAI
errAlencar, Anna Luiza Farias; Jibril, Abdurrahman Hassan; Svensmark, Birgitta; Agerskov, Lene; Martin, Henrik Laessoe; Stegger, Marc; Saidenberg, Andre Becker; Liu, Gang; Hounmanou, Yaovi Mahuton Gildas; Juel, Annette Sonderholm; Olsen, John Elmerdahl; Olsen, Rikke Heidemann
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Mechanistic divergence between SOS response activation and antibiotic-induced plasmid conjugation in Escherichia coli
errMICROBIOLOGY SPECTRUM
IF3.8
err2025-05-28
err0
errOAAI
errZhao, Ruoxuan; Nawrocki, Arkadiusz; Moller-Jensen, Jakob; Liu, Gang; Olsen, John Elmerdahl; Thomsen, Line Elnif
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errSave
Deletion of pcnB affects antibiotic susceptibility in resistant Escherichia coli by reducing copy number of ColE1-family plasmids
errSCIENTIFIC REPORTS
IF3.9
err2025-03-11
err0
errOAAI
errWellner, Sandra Marina; Fei, Xiao; Herrero-Fresno, Ana; Olsen, John Elmerdahl
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errSave
Outer Membrane Proteins as Vaccine Targets Against Lawsonia intracellularis in Piglets
errVACCINES
IF3.4
err2025-02-19
err0
errOAAI
errAves, Kara L.; Fresno, Ana H.; Nisar, Sajid; Saraiva, Mauro M.; Goecke, Nicole B.; Sander, Adam F.; Nielsen, Morten A.; Olsen, John E.; Guerra, Priscila R.
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A sequencing-based method for quantifying gene-deletion mutants of bacteria in the intracellular environment
errFRONTIERS IN MICROBIOLOGY
IF4.5
err2025-01-28
err0
errOAAI
errFei, Xiao; Yuan, Zengzhi; Wellner, Sandra Marina; Ma, Yibing; Olsen, John Elmerdahl
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errSave
The Secondary Resistome of Methicillin-Resistant Staphylococcus aureus to β-Lactam Antibiotics
errANTIBIOTICS-BASEL
IF4.6
err2025-01-21
err0
errOAAI
errAbdelmalek, Nader; Yousief, Sally Waheed; Bojer, Martin Saxtorph; Alobaidallah, Mosaed Saleh A.; Olsen, John Elmerdahl; Paglietti, Bianca
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errSave
Occurrence of Salmonella enterica in faecal sludge from Nigeria and genetic relatedness with strains associated with human infections in Africa
errJOURNAL OF APPLIED MICROBIOLOGY
IF3.2
err2024-11-22
err0
PREAI
errJibril, Abdurrahman Hassan; Dalsgaard, Anders; Okeke, Iruka N.; Ibrahim, Aliyu Musawa; Olsen, John Elmerdahl
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Antimicrobial use and antimicrobial resistance in Escherichia coli in semi-intensive and free-range poultry farms in Uganda
errONE HEALTH
IF4.5
err2024-06-01
err1
errOAAI
errMbatidde, Irene; Ndoboli, Dickson; Ayebare, Dreck; Muloi, Dishon; Roesel, Kristina; Ochieng, Linnet; Dione, Michel; Tenhagen, Bernd-Alois; Biryomumaisho, Savino; Wampande, Eddie; Wieland, Barbara; Olsen, John Elmerdahl; Moodley, Arshnee
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Genome-wide identification of fitness-genes in aminoglycoside-resistant Escherichia coli during antibiotic stress
errSCIENTIFIC REPORTS
IF3.9
err2024-02-20
err3
errOAAI
errWellner, Sandra Marina; Alobaidallah, Mosaed Saleh A.; Fei, Xiao; Herrero-Fresno, Ana; Olsen, John Elmerdahl
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Diet composition drives tissue-specific intensity of murine enteric infections
errMBIO
IF4.7
err2024-02-14
err1
errOAAI
errIsraelson, Helene; Vedsted-Jakobsen, Amalie; Zhu, Ling; Gagnaire, Aurelie; von Muenchow, Alexandra; Polakovicova, Nina; Valente, Angela H.; Raza, Ali; Andersen-Civil, Audrey I. S.; Olsen, John E.; Myhill, Laura J.; Geldhof, Peter; Williams, Andrew R.
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Genomic Features and Phylogenetic Analysis of Antimicrobial-Resistant Salmonella Mbandaka ST413 Strains
errMICROORGANISMS
IF4.2
err2024-02-01
err4
errOAAI
errBenevides, Valdinete P.; Saraiva, Mauro M. S.; Nascimento, Camila F.; Delgado-Suarez, Enrique J.; Oliveira, Celso J. B.; Silva, Saura R.; Miranda, Vitor F. O.; Christensen, Henrik; Olsen, John E.; Berchieri Junior, Angelo
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Enhancing the Efficacy of Chloramphenicol Therapy for Escherichia coli by Targeting the Secondary Resistome
errANTIBIOTICS-BASEL
IF4.6
err2024-01-12
err6
errOAAI
errAlobaidallah, Mosaed Saleh A.; Garcia, Vanesa; Wellner, Sandra M.; Thomsen, Line E.; Herrero-Fresno, Ana; Olsen, John Elmerdahl
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Research Directions

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Co-authors
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