Ørjan Samuelsen
Professor
Marius Linkevicius,
Rémy A Bonnin,
Erik Alm,
Olov Svartström,
Petra Apfalter,
Rainer Hartl
m.fl.:
Rapid cross-border emergence of NDM-5-producing Escherichia coli in the European Union/European Economic Area, 2012 to June 2022
Sergio Arredondo Alonso,
Rebecca Ashley Gladstone,
Anna Kaarina Pöntinen,
João Alves Gama,
Anita C. Schürch,
Val F. Lanza
m.fl.:
Mge-cluster: a reference-free approach for typing bacterial plasmids
Jessica K Calland,
Kaisa Haukka,
Stephen W Kpordze,
Atanyiwoen Brusah,
Marta Corbella,
Cristina Merla
m.fl.:
Population structure and antimicrobial resistance among Klebsiella isolates sampled from human, animal, and environmental sources in Ghana: a cross-sectional genomic One Health study
Lancet Microbe 2023 DOI
Oskar Ljungquist,
Bjørg Haldorsen,
Anna Kaarina Pöntinen,
Jessin Janice,
Ellen Haldis Josefsen,
Petter Elstrøm
m.fl.:
Nationwide, population-based observational study of the molecular epidemiology and temporal trend of carbapenemase-producing Enterobacterales in Norway, 2015 to 2021
Greta Petazzoni,
Greta Bellinzona,
Cristina Merla,
Marta Corbella,
Vincenzina Monzillo,
Ørjan Samuelsen
m.fl.:
The COVID-19 Pandemic Sparked off a Large-Scale Outbreak of Carbapenem-Resistant Acinetobacter baumannii from the Endemic Strains at an Italian Hospital
Niclas Peter Raffelsberger,
Dorota Julia Buczek,
Kristian Svendsen,
Lars Småbrekke,
Anna Kaarina Pöntinen,
Iren Høyland Löhr
m.fl.:
Community carriage of ESBL-producing Escherichia coli and Klebsiella pneumoniae: a cross-sectional study of risk factors and comparative genomics of carriage and clinical isolates
Paul Christoffer Lindemann,
Torunn Pedersen,
Dorthea Hagen Oma,
Jessin Janice,
Fredrik Grøvan,
Ghantous Milad Chedid
m.fl.:
Intraregional hospital outbreak of OXA-244-producing Escherichia coli ST38 in Norway, 2020
Sergio Arredondo Alonso,
George Blundell-Hunter,
Zuyi Fu,
Rebecca Ashley Gladstone,
Alfred Fillol-Salom,
Jessica Loraine
m.fl.:
Evolutionary and functional history of the Escherichia coli K1 capsule
Pete Kinross,
Carlo Gagliotti,
Hanna Merk,
Diamantis Plachouras,
Dominique L. Monnet,
Liselotte Diaz Högberg
m.fl.:
Large increase in bloodstream infections with carbapenem-resistant Acinetobacter species during the first 2 years of the COVID-19 pandemic, EU/EEA, 2020 and 2021
Eurosurveillance 2022 DOI
Tommi Mäklin,
Harry Arthur Frank Wright Thorpe,
Anna Kaarina Pöntinen,
Rebecca Ashley Gladstone,
Yan Shao,
Maiju Pesonen
m.fl.:
Strong pathogen competition in neonatal gut colonisation
Kenneth Lindstedt,
Dorota Julia Buczek,
Torunn Annie Pedersen,
Erik Hjerde,
Niclas Peter Raffelsberger,
Yutaka Suzuki
m.fl.:
Detection of Klebsiella pneumoniae human gut carriage: a comparison of culture, qPCR, and whole metagenomic sequencing methods
Aleksandra Jakovljev,
Jan Egil Afset,
Kjersti Haugum,
Harald Otto Steinum,
Torunn Gresdal Rønning,
Ørjan Samuelsen
m.fl.:
Phenotypic and genotypic characterisation of thymine auxotrophy in Escherichia coli isolated from a patient with recurrent bloodstream infection
Vidar Sørum,
Emma Lu Øynes,
Anna Sollied Møller,
Klaus Harms,
Ørjan Samuelsen,
Nicole L. Podnecky
m.fl.:
Evolutionary Instability of Collateral Susceptibility Networks in Ciprofloxacin-Resistant Clinical Escherichia coli Strains
Tommi Mäklin,
Teemu Kallonen,
Jarno Alanko,
Ørjan Samuelsen,
Kristin Hegstad,
Veli Mäkinen
m.fl.:
Bacterial genomic epidemiology with mixed samples
Jonina Gudmundsdottir,
Elizabeth G. Aarag Fredheim,
Catharina I.M. Koumans,
Joachim Hegstad,
Po-Cheng Tang,
Dan I. Andersson
m.fl.:
The chemotherapeutic drug methotrexate selects for antibiotic resistance
Jessin Janice,
Nicholas Agyepong,
Alex Owusu-Ofori,
Usha Govinden,
Sabiha Essack,
Ørjan Samuelsen
m.fl.:
Carbapenem resistance determinants acquired through novel chromosomal integrations in extensively drug-resistant pseudomonas aeruginosa
Rebecca Ashley Gladstone,
Alan McNally,
Anna Kaarina Pöntinen,
Gerry Tonkin-Hill,
John A. Lees,
Kusti Onni Skytén
m.fl.:
Emergence and dissemination of antimicrobial resistance in Escherichia coli causing bloodstream infections in Norway in 2002–17: a nationwide, longitudinal, microbial population genomic study
Niclas Peter Raffelsberger,
Marit Andrea Klokkhammer Hetland,
Kristian Svendsen,
Lars Småbrekke,
Iren Høyland Löhr,
Lotte Andreassen
m.fl.:
Gastrointestinal carriage of Klebsiella pneumoniae in a general adult population: a cross-sectional study of risk factors and bacterial genomic diversity
Julia Kloos,
João A Gama,
Joachim Hegstad,
Ørjan Samuelsen,
Pål J Johnsen
:
Piggybacking on Niche Adaptation Improves the Maintenance of Multidrug-Resistance Plasmids
Sergio Arredondo Alonso,
Anna Kaarina Pöntinen,
Francois Pierre Alexandre Cleon,
Rebecca Ashley Gladstone,
Anita C. Schürch,
Pål Jarle Johnsen
m.fl.:
A high-throughput multiplexing and selection strategy to complete bacterial genomes
Supathep Tansirichaiya,
Richard N. Goodman,
Xinyu Guo,
Issra Bulgasim,
Ørjan Samuelsen,
Mohammed Al-Haroni
m.fl.:
Intracellular Transposition and Capture of Mobile Genetic Elements following Intercellular Conjugation of Multidrug Resistance Conjugative Plasmids from Clinical Enterobacteriaceae Isolates
Aasmund Fostervold,
Marit Andrea Klokkhammer Hetland,
Ragna-Johanne Bakksjø,
Eva Bernhoff,
Kathryn E. Holt,
Ørjan Samuelsen
m.fl.:
A nationwide genomic study of clinical Klebsiella pneumoniae in
Norway 2001–15: introduction and spread of ESBLs facilitated by
clonal groups CG15 and CG307
Christopher Frøhlich,
João Alves Gama,
Klaus Harms,
Viivi H. A. Hirvonen,
Bjarte Aarmo Lund,
Marc W. van der Kamp
m.fl.:
Cryptic β-Lactamase Evolution Is Driven by Low β-Lactam Concentrations
Catherine Ludden,
Felix Lötsch,
Erik Alm,
Narender Kumar,
Karin Johansson,
Barbara Albiger
m.fl.:
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
Joao Pedro Alves Gama,
Julia Maria Kloos,
Pål Jarle Johnsen,
Ørjan Samuelsen
:
Host dependent maintenance of a blaNDM-1-encoding plasmid in clinical Escherichia coli isolates
Julia Maria Kloos,
Joao Pedro Alves Gama,
Pål Jarle Johnsen,
Ørjan Samuelsen
:
Host dependent maintenance of a blaNDM-1-encoding plasmid in clinical Escherichia coli isolates
Scientific Reports 2020 DOI
Torunn Annie Pedersen,
Marit Gjerde Tellevik,
Øyvind Kommedal,
Paul Christoffer Lindemann,
Sabrina John Moyo,
Jessin Janice James Peter
m.fl.:
Horizontal plasmid transfer among klebsiella pneumoniae isolates is the key factor for dissemination of extended-spectrum β-lactamases among children in Tanzania
Hanna-Kirsti S. Leiros,
Ane Molden Thomassen,
Ørjan Samuelsen,
Carl-Fredrik Flach,
Stathis D. Kotsakis,
Joakim Larsson
:
Structural insights into the enhanced carbapenemase
efficiency of OXA-655 compared to OXA-10
Christopher Frøhlich,
Vidar Sørum,
Sandra Huber,
Ørjan Samuelsen,
Fanny Berglund,
Erik Kristiansson
m.fl.:
Structural and biochemical characterization of the environmental MBLs MYO-1, ECV-1 and SHD-1
Ørjan Samuelsen,
Ove Alexander Høgmoen Åstrand,
Christopher Frøhlich,
Adam Heikal,
Susann Skagseth,
Trine Josefine Olsen Carlsen
m.fl.:
ZN148 Is a Modular Synthetic Metallo-beta-Lactamase Inhibitor That Reverses Carbapenem Resistance in Gram-Negative Pathogens In Vivo
Christopher Frøhlich,
Vidar Sørum,
Ane Molden Thomassen,
Pål Jarle Johnsen,
Hanna-Kirsti S. Leiros,
Ørjan Samuelsen
:
OXA-48-Mediated Ceftazidime-Avibactam Resistance Is Associated with Evolutionary Trade-Offs
Petter Elstrøm,
Elisabeth Astrup,
Kristin Hegstad,
Ørjan Samuelsen,
Hege Enger,
Oliver Kacelnik
:
The fight to keep resistance at bay, epidemiology of carbapenemase producing organisms (CPOs), vancomycin resistant enterococci (VRE) and methicillin resistant Staphylococcus aureus (MRSA) in Norway, 2006-2017
Anthony Prandina,
Sylvie Radix,
Marc Le Borgne,
Lars Petter Jordheim,
Zineb Bousfiha,
Christopher Fröhlich
m.fl.:
Synthesis and biological evaluation of new dipicolylamine zinc chelators as metallo-β-lactamase inhibitors
Geir Kildahl-Andersen,
Christian Schnaars,
Anthony Prandina,
Sylvie Radix,
Marc Le Borgne,
Lars Petter Jordheim
m.fl.:
Synthesis and biological evaluation of zinc chelating compounds as metallo-β-lactamase inhibitors
MedChemComm 2019 DOI
Ilya Nikolaevich Zykov,
Niels Frimodt-Møller,
Lars Småbrekke,
Arnfinn Sundsfjord,
Ørjan Samuelsen
:
Efficacy of mecillinam against clinical multidrug-resistant Escherichia coli in a murine urinary tract infection model
Nicole L. Podnecky,
Elizabeth Aarag,
Julia Maria Kloos,
Vidar Sørum,
Raul Primicerio,
Adam Paul Roberts
m.fl.:
Conserved collateral antibiotic susceptibility networks in diverse clinical strains of Escherichia coli.
Marit Hetland,
Mia Angelique Winkler,
Thomas D Stanton,
Ryan R. Wick,
Margaret MC Lam,
Aasmund Fostervold
m.fl.:
Klebsiella pneumoniae ecology and antimicrobial resistance in a One Health perspective
2023
Julia Maria Kloos,
Lea Jänisch,
Anna Kaarina Pöntinen,
Ørjan Samuelsen,
Pål Jarle Johnsen,
Jukka Corander
m.fl.:
Different metabolic proficiency among dominant ExPEC lineages
2022
Christopher Frøhlich,
Vidar Sørum,
Nobuhiko Tokuriki,
Ørjan Samuelsen
:
Evolution of ß-lactamase mediated cefiderocol resistance
2022
Pål Jarle Johnsen,
Elizabeth G Aarag Fredheim,
Ørjan Samuelsen,
Klaus Harms
:
The role of drugs used in cancer chemotherapy as drivers of antibiotic resistance evolution in Escherichia coli
2022
Rebecca Ashley Gladstone,
Alan McNally,
Pål Jarle Johnsen,
Ørjan Samuelsen,
Jukka Corander
:
Antimicrobial resistance genes and clonal success in Escherichia coli isolates causing bloodstream infection – Authors’ reply
Lancet Microbe 2021 DOI
Bjørg Haldorsen,
Jessin Janice,
Ørjan Samuelsen
:
Evaluation of the Amplex eazyplex® SuperBug Acineto test for detection of acquired OXA and NDM carbapenemases in Acinetobacter spp.
Journal of Global Antimicrobial Resistance 2021 DOI
João Alves Gama,
Julia Maria Kloos,
Joachim Hegstad,
Ørjan Samuelsen,
Pål Jarle Johnsen
:
Plasmid cost alleviation as a consequence of niche-adaptation
2021
Julia Maria Kloos,
João Alves Gama,
Joachim Hegstad,
Ørjan Samuelsen,
Pål Jarle Johnsen
:
Plasmid Cost Alleviation By Hitchhiking On Niche-adaptation
2021
Julia Maria Kloos,
Joao Pedro Alves Gama,
Joachim Hegstad,
Ørjan Samuelsen,
Pål Jarle Johnsen
:
E. coli Niche Adaptation Improves Plasmid Maintenance
2021
Christopher Frøhlich,
Hanna-Kirsti S. Leiros,
Pål Jarle Johnsen,
Ørjan Samuelsen
:
Sub-inhibitory concentrations of ceftazidime drive evolution of the OXA-48 carbapenemase
2019
Christopher Frøhlich,
Pål Jarle Johnsen,
Hanna-Kirsti Schrøder Leiros,
Ørjan Samuelsen
:
Evolution of OXA-48 under sub-MIC conditions
2019
Vidar Sørum,
Anna Sollied Møller,
Pål Jarle Johnsen,
Ørjan Samuelsen,
Sören Abel,
Nicole L. Podnecky
:
Evolutionary stability of collateral effects in ciprofloxacin resistant clinical Escherichia coli strains
2019
Vidar Sørum,
Anna Sollied Møller,
Sören Abel,
Ørjan Samuelsen,
Nicole L. Podnecky,
Pål Jarle Johnsen
:
Evolutionary stability of collateral effects in ciprofloxacin resistant clinical Escherichia coli strains
2019
Vidar Sørum,
Emma Lu Øynes,
Anna Møller,
Nicole L. Podnecky,
Sören Abel,
Ørjan Samuelsen
m.fl.:
Evolutionary stability of collateral susceptibility networks in clinical Escherichia coli strains
2019
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Forskningsinteresser
Through my positions as Professor II at the Microbial Pharmacology and Population Biology Research Group and as senior scientist at the Norwegian National Advisory Unit on Detection of Antimicrobial Resistance my research focuses broadly on the following topics molecular epidemiology, evaluation of diagnostic methods, biochemical and structural characterization of β-lactamases, development of β-lactamase inhibitors and the evolutionary aspects and transmission dynamics of resistance plasmids.