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Microbiology

D-Index
44
Citations
8519
World Ranking
5116
National Ranking
23

Overview

Ørjan Samuelsen is affiliated with the University Hospital of North Norway. Their research contributions focus on microbiology, molecular medicine, and antimicrobial resistance, reflecting intersections of biochemistry, genetics, and medicine.

The scientist has authored numerous publications emphasizing antibiotic resistance mechanisms, bacterial identification, and infection epidemiology. Their main fields of study include:

  • Biochemistry, Genetics and Molecular Biology
  • Medicine

The subfields of research encompass molecular medicine, endocrinology, molecular biology, epidemiology, and genetics.

  • Molecular Medicine
  • Endocrinology
  • Molecular Biology
  • Epidemiology
  • Genetics

Key topics addressed in their work cover antibiotic resistance in bacteria, Escherichia coli research, antibiotics pharmacokinetics and efficacy, gut microbiota and health, bacterial susceptibility testing, Enterobacteriaceae, and bacteriophage interactions.

  • Antibiotic Resistance in Bacteria
  • Escherichia coli research studies
  • Antibiotics Pharmacokinetics and Efficacy
  • Bacterial Identification and Susceptibility Testing
  • Gut microbiota and health
  • Enterobacteriaceae and Cronobacter Research
  • Bacteriophages and microbial interactions

Notable recent publications by Ørjan Samuelsen include:

  • Integrated chromosomal and plasmid sequence analyses reveal diverse modes of carbapenemase gene spread among Klebsiella pneumoniae (2020), published in Proceedings of the National Academy of Sciences
  • Emergence and dissemination of antimicrobial resistance in Escherichia coli causing bloodstream infections in Norway in 2002-17: a nationwide, longitudinal, microbial population genomic study (2021), published in The Lancet Microbe
  • Gastrointestinal carriage of Klebsiella pneumoniae in a general adult population: a cross-sectional study of risk factors and bacterial genomic diversity (2021), published in Gut Microbes
  • Cross-border spread of blaNDM-1- and blaOXA-48-positive Klebsiella pneumoniae: a European collaborative analysis of whole genome sequencing and epidemiological data, 2014 to 2019 (2020), published in Eurosurveillance
  • Evolution of β-lactamase-mediated cefiderocol resistance (2022), published in Journal of Antimicrobial Chemotherapy

Frequent co-authors of Ørjan Samuelsen include:

  • Jukka Corander
  • Pål J. Johnsen
  • Anna K. Pöntinen
  • Arnfinn Sundsfjord
  • Rebecca A. Gladstone

The scientist publishes regularly in several venues, with the most frequent being:

  • bioRxiv (Cold Spring Harbor Laboratory)
  • Eurosurveillance
  • SSRN Electronic Journal
  • The Lancet Microbe
  • Nature Communications

Best Publications

  • Rapid evolution and spread of carbapenemases among Enterobacteriaceae in Europe

    R. Cantón;M. Akóva;Y. Carmeli;C.G. Giske

  • Occurrence of carbapenemase-producing Klebsiella pneumoniae and Escherichia coli in the European survey of carbapenemase-producing Enterobacteriaceae (EuSCAPE): a prospective, multinational study.

    Hajo Grundmann;Hajo Grundmann;Corinna Glasner;Corinna Glasner;Barbara Albiger;David M Aanensen;David M Aanensen

  • The role of whole genome sequencing in antimicrobial susceptibility testing of bacteria : report from the EUCAST Subcommittee

    M J Ellington;O Ekelund;Frank Møller Aarestrup;R Canton

  • Insights into the global molecular epidemiology of carbapenem non-susceptible clones of Acinetobacter baumannii.

    Nabil Karah;Nabil Karah;Arnfinn Sundsfjord;Arnfinn Sundsfjord;Kevin Towner;Ørjan Samuelsen

  • A sensitive and specific phenotypic assay for detection of metallo-β-lactamases and KPC in Klebsiella pneumoniae with the use of meropenem disks supplemented with aminophenylboronic acid, dipicolinic acid and cloxacillin

    C.G. Giske;C.G. Giske;L. Gezelius;Ø. Samuelsen;M. Warner

  • Niclosamide is a proton carrier and targets acidic endosomes with broad antiviral effects.

    Andreas Jurgeit;Robert McDowell;Stefan Moese;Eric Meldrum

  • Escherichia coli Sequence Type 410 Is Causing New International High-Risk Clones

    Louise Roer;Søren Overballe-Petersen;Frank Hansen;Kristian Schønning;Kristian Schønning

  • Emergence of clonally related Klebsiella pneumoniae isolates of sequence type 258 producing plasmid-mediated KPC carbapenemase in Norway and Sweden

    Ørjan Samuelsen;Umaer Naseer;Ståle Tofteland;Dag Harald Skutlaberg

  • Molecular Epidemiology of Metallo-β-Lactamase-Producing Pseudomonas aeruginosa Isolates from Norway and Sweden Shows Import of International Clones and Local Clonal Expansion

    Ørjan Samuelsen;Mark A. Toleman;Arnfinn Sundsfjord;Arnfinn Sundsfjord;Johan Rydberg

  • Lactoferricin B inhibits bacterial macromolecular synthesis in Escherichia coli and Bacillus subtilis.

    Hilde Ulvatne;Ørjan Samuelsen;Ørjan Samuelsen;Hanne H. Haukland;Hanne H. Haukland;Manuela Krämer

  • A long-term low-frequency hospital outbreak of KPC-producing Klebsiella pneumoniae involving Intergenus plasmid diffusion and a persisting environmental reservoir.

    Ståle Tofteland;Umaer Naseer;Umaer Naseer;Jan Helge Lislevand;Arnfinn Sundsfjord;Arnfinn Sundsfjord

  • Species identification and molecular characterization of Acinetobacter spp. blood culture isolates from Norway

    Nabil Karah;Nabil Karah;Bjørg Haldorsen;Kristin Hegstad;Kristin Hegstad;Gunnar Skov Simonsen;Gunnar Skov Simonsen;Gunnar Skov Simonsen

  • Molecular characterization of VIM-producing Klebsiella pneumoniae from Scandinavia reveals genetic relatedness with international clonal complexes encoding transferable multidrug resistance

    Ø. Samuelsen;Mark Alexander Howard Toleman;V. Hasseltvedt;K. Fuursted

  • Conserved collateral antibiotic susceptibility networks in diverse clinical strains of Escherichia coli.

    Nicole L Podnecky;Elizabeth G A Fredheim;Julia Kloos;Vidar Sørum

  • Molecular epidemiology of KPC-2- producing Klebsiella pneumoniae isolates in Brazil: the predominance of sequence type 437

    Liliane M. Seki;Polyana S. Pereira;Maria da Penha A.H. de Souza;Magda de S. Conceição

  • Antimicrobial and cytotoxic activity of agelasine and agelasimine analogs.

    Anders Vik;Erik Hedner;Colin Charnock;Linda W. Tangen

  • Identification of NDM-1-producing Enterobacteriaceae in Norway

    Ørjan Samuelsen;Carina M. Thilesen;Lars Heggelund;Anne N. Vada

  • Plasmid-mediated quinolone resistance determinants qnr and aac(6′)-Ib-cr in Escherichia coli and Klebsiella spp. from Norway and Sweden

    Nabil Karah;Nabil Karah;Laurent Poirel;Stina Bengtsson;Martin Sundqvist

  • Comparison of disk diffusion, Etest and VITEK2 for detection of carbapenemase‐producing Klebsiella pneumoniae with the EUCAST and CLSI breakpoint systems

    M. Vading;Ø. Samuelsen;B. Haldorsen;A.S. Sundsfjord;A.S. Sundsfjord

  • Emergence and dissemination of antimicrobial resistance in Escherichia coli causing bloodstream infections in Norway in 2002–17: a nationwide, longitudinal, microbial population genomic study

    Rebecca Ashley Gladstone;Alan McNally;Anna Kaarina Pöntinen;Gerry Tonkin-Hill

  • Epidemic of carbapenem-resistant Klebsiella pneumoniae in Europe is driven by nosocomial spread

    Sophia David;Sandra Reuter;Simon R. Harris;Corinna Glasner

Frequent Co-Authors

Arnfinn Sundsfjord
Arnfinn Sundsfjord University of Tromsø - The Arctic University of Norway
Christian G. Giske
Christian G. Giske Karolinska University Hospital
Timothy R. Walsh
Timothy R. Walsh University of Oxford
Gunnar Skov Simonsen
Gunnar Skov Simonsen Wellcome Sanger Institute
Jukka Corander
Jukka Corander University of Oslo
Katie L. Hopkins
Katie L. Hopkins Public Health England
Anette M. Hammerum
Anette M. Hammerum Statens Serum Institut
Mark Toleman
Mark Toleman Cardiff University
Kathryn E. Holt
Kathryn E. Holt London School of Hygiene & Tropical Medicine
Henrik Hasman
Henrik Hasman Statens Serum Institut

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