Arnfinn Sundsfjord
Marit Hetland,
Mia Angelique Winkler,
Håkon Kaspersen,
Fredrik Håkonsholm,
Ragna-Johanne Bakksjø,
Eva Bernhoff
et al.:
A genome-wide One Health study of Klebsiella pneumoniae in Norway reveals overlapping populations but few recent transmission events across reservoirs
Genome Medicine 28. April 2025 DOI
Astri Lervik Larsen,
Torunn Annie Pedersen,
Arnfinn Sundsfjord,
Theodor Anton Ross,
Anja Guleng,
Jon Birger Haug
et al.:
Hospital toilets and drainage systems as a reservoir for a long-term polyclonal outbreak of clinical infections with multidrug-resistant Klebsiella oxytoca species complex
Infection Prevention in Practice (IPIP) 2025 DOI
Bjørg Haldorsen,
Ørjan Samuelsen,
Jessin Janice,
Miriam Sare,
Mari Molvik,
Arnfinn Sundsfjord
et al.:
Import of global high-risk clones is the primary driver of carbapenemase-producing Pseudomonas aeruginosa in Norway
Journal of Medical Microbiology 2025 DOI
Bhupender Singh,
Mia Angelique Winkler,
Wasifa Kabir,
Johanna U Ericson,
Arnfinn Sundsfjord
:
Lack of Spontaneous and Adaptive Resistance Development in Staphylococcus aureus Against the Antimicrobial Peptide LTX-109
Antibiotics 2025 DOI
Dagfinn Skaare,
Inger Lill Anthonisen,
Zecic Nermin,
Andrew John Jenkins,
Dominique Andree Yette Caugant,
Trond Egil Ranheim
et al.:
Genomic profiling of cefotaxime-resistant Haemophilus influenzae from Norway and Sweden reveals extensive expansion of virulent multidrug-resistant international clones
Frontiers in Microbiology 2025 DOI
Marit Hetland,
Mia Angelique Winkler,
Håkon Kaspersen,
Fredrik Håkonsholm,
Ragna-Johanne Bakksjø,
Eva Bernhoff
et al.:
Complete genomes of 568 diverse Klebsiella pneumoniae species complex isolates from humans, animals, and marine sources in Norway from 2001 to 2020
Microbiology Resource Announcements (MRA) 2025 DOI
Hege Harboe-Sjåvik,
Kristoffer Endresen,
Sandra Elena Åsheim,
Arnfinn Ståle Sundsfjord
:
FilmArray (BCID2) provides essential and timely results in bloodstream infections in small acute care hospitals without conventional microbiology services
Silvia Bertagnolio,
Zlatina Dobreva,
Chad M Centner,
Ioana Diana Olaru,
Daniele Donà,
Stefano Burzo
et al.:
WHO global research priorities for antimicrobial resistance in human health
Kara K. Tsang,
Margaret M C Lam,
Ryan R. Wick,
Kelly L. Wyres,
Michael Bachman,
Stephen Baker
et al.:
Diversity, functional classification and genotyping of SHV β-lactamases in Klebsiella pneumoniae
Aasmund Fostervold,
Niclas Peter Raffelsberger,
Marit Hetland,
Ragna-Johanne Bakksjø,
Eva Bernhoff,
Ørjan Samuelsen
et al.:
Risk of death in Klebsiella pneumoniae bloodstream infections is associated with specific phylogenetic lineages
Theresa Wagner,
Jessin Janice,
Marc Schluz,
Susan Ballard,
Anders da Silva,
Geoffrey W Coombs
et al.:
Reversible vancomycin susceptibility within emerging ST1421 Enterococcus faecium strains is associated with rearranged vanA-gene clusters and increased vanA plasmid copy number
Marit Hetland,
Jane Hawkey,
Eva Bernhoff,
Ragna-Johanne Bakksjø,
Håkon Kaspersen,
Siren Rettedal
et al.:
Within-patient and global evolutionary dynamics of Klebsiella pneumoniae ST17
Kristin Hegstad,
Anna Kaarina Pöntinen,
Jørgen Bjørnholt,
Else Quist Paulsen,
Arnfinn Ståle Sundsfjord
:
The first tigecycline resistant Enterococcus faecium in Norway was related to tigecycline exposure
Mushtaq al Rubaye,
Jessin Janice,
Jørgen Vildershøj Bjørnholt,
Oliver Kacelnik,
Bjørg C. Haldorsen,
Randi M. Nygaard
et al.:
The population structure of vancomycin-resistant and
-susceptible Enterococcus faecium in a low-prevalence
antimicrobial resistance setting is highly influenced by
circulating global hospital-associated clones
Mushtaq Talib Shawi al Rubaye,
Jessin Janice,
Jørgen Bjørnholt,
Iren Høyland Löhr,
Arnfinn Ståle Sundsfjord,
Kristin Hegstad
:
The first vanE-type vancomycin resistant Enterococcus faecalis isolates in Norway – phenotypic and molecular characteristics
Niclas Peter Raffelsberger,
Dorota Julia Buczek,
Kristian Svendsen,
Lars Småbrekke,
Anna Kaarina Pöntinen,
Iren Høyland Löhr
et al.:
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
Theresa Wagner,
Benjamin P Howden,
Arnfinn Sundsfjord,
Kristin Hegstad
:
Transiently silent acquired antimicrobial resistance: an emerging challenge in susceptibility testing
Oskar Ljungquist,
Bjørg Haldorsen,
Anna Kaarina Pöntinen,
Jessin Janice,
Ellen Haldis Josefsen,
Petter Elstrøm
et al.:
Nationwide, population-based observational study of the molecular epidemiology and temporal trend of carbapenemase-producing Enterobacterales in Norway, 2015 to 2021
Tore Taksdal Stubhaug,
Christian G. Giske,
Ulrik S Justesen,
Gunnar Kahlmeter,
Erika Matuschek,
Arnfinn Sundsfjord
et al.:
Antimicrobial susceptibility testing of Bacteroides species by disk diffusion: The NordicAST Bacteroides study
Theresa Maria Wagner,
Anna Kaarina Pöntinen,
Mushtaq T.S. AL Rubaye,
Arnfinn Ståle Sundsfjord,
Kristin Hegstad
:
Adaptive cell wall thickening in Enterococcus faecalis is associated with decreased vancomycin susceptibility
Clinical Microbiology and Infection (CMI) 2023 DOI
Paul Christoffer Lindemann,
Torunn Pedersen,
Dorthea Hagen Oma,
Jessin Janice,
Fredrik Grøvan,
Ghantous Milad Chedid
et al.:
Intraregional hospital outbreak of OXA-244-producing Escherichia coli ST38 in Norway, 2020
Faheema E. Choonara,
Bjørg Haldorsen,
Isaac Ndhlovu,
Osborne Saulosi,
Tarsizio Maida,
Fanuel Lampiao
et al.:
Antimicrobial susceptibility profiles of clinically important bacterial pathogens at the Kamuzu Central Hospital in Lilongwe, Malawi
Kirsten Midttun Gravningen,
Oliver Kacelnik,
Egil Lingaas,
Torunn Pedersen,
Bjørn Gunnar Iversen,
Anne Mette Asfeldt
et al.:
Pseudomonas aeruginosa countrywide outbreak in hospitals linked to pre-moistened non-sterile washcloths, Norway, October 2021 to April 2022
Faheema Ebrahim Choonara,
Bjørg Haldorsen,
Jessin Janice,
Joshua Mbanga,
Isaac Ndhlovu,
Osborne Saulosi
et al.:
Molecular Epidemiological Characterisation of ESBL- and Plasmid-Mediated AmpC-Producing Escherichia coli and Klebsiella pneumoniae at Kamuzu Central Hospital, Lilongwe, Malawi
Kenneth Lindstedt,
Dorota Julia Buczek,
Torunn Annie Pedersen,
Erik Hjerde,
Niclas Peter Raffelsberger,
Yutaka Suzuki
et al.:
Detection of Klebsiella pneumoniae human gut carriage: a comparison of culture, qPCR, and whole metagenomic sequencing methods
Caillan Crowe-McAuliffe,
Victoriia Murina,
Kathryn Jane Turnbull,
Susanne Huch,
Marje Kasari,
Hiraku Takada
et al.:
Structural basis for PoxtA-mediated resistance to phenicol and oxazolidinone antibiotics
Abel F.N.D. Phiri,
Akebe Luther King Abia,
Daniel Gyamfi Amoako,
Rajab Mkakosya,
Arnfinn Sundsfjord,
Sabiha Essack
et al.:
Burden, antibiotic resistance, and clonality of shigella spp. Implicated in community-acquired acute diarrhoea in Lilongwe, Malawi
Jessin Janice,
Nicholas Agyepong,
Alex Owusu-Ofori,
Usha Govinden,
Sabiha Essack,
Ørjan Samuelsen
et al.:
Carbapenem resistance determinants acquired through novel chromosomal integrations in extensively drug-resistant pseudomonas aeruginosa
Marit Østlyngen Riibe,
Sveinung Wergeland Sørbye,
Gunnar Skov Simonsen,
Arnfinn Sundsfjord,
Josef Ekgren,
Jan Martin Maltau
:
Risk of cervical intraepithelial neoplasia grade 3 or higher (CIN3+) among women with HPV-test in 1990–1992, a 30-year follow-up study
Mushtaq T.S. Al-Rubaye,
Jessin Janice,
Jørgen Vildershøj Bjørnholt,
Aleksandra Jakovljev,
Maria Elisabeth Hultström,
Arnfinn Sundsfjord
et al.:
Novel genomic islands and a new vanD-subtype in the first sporadic VanD-type vancomycin resistant enterococci in Norway
Niclas Peter Raffelsberger,
Marit Andrea Klokkhammer Hetland,
Kristian Svendsen,
Lars Småbrekke,
Iren Høyland Löhr,
Lotte Andreassen
et al.:
Gastrointestinal carriage of Klebsiella pneumoniae in a general adult population: a cross-sectional study of risk factors and bacterial genomic diversity
Calvina Estalva,
Tomas Zimba,
Sekyere John,
Usha Govinden,
Hafizah Y. Chenia,
Gunnar Skov Simonsen
et al.:
High prevalence of multidrug resistant ESBL- and plasmid mediated AmpC-producing clinical isolates of Escherichia coli at Maputo Central Hospital, Mozambique
Aasmund Fostervold,
Marit Andrea Klokkhammer Hetland,
Ragna-Johanne Bakksjø,
Eva Bernhoff,
Kathryn E. Holt,
Ørjan Samuelsen
et al.:
A nationwide genomic study of clinical Klebsiella pneumoniae in
Norway 2001–15: introduction and spread of ESBLs facilitated by
clonal groups CG15 and CG307
Theresa Wagner,
Jessin Janice,
Audun Sivertsen,
Ingegerd Sjögren,
Arnfinn Sundsfjord,
Kristin Hegstad
:
Alternative vanHAX promoters and increased vanA-plasmid copy number resurrect silenced glycopeptide resistance in Enterococcus faecium
Sara Lino Faife,
Tomas Zimba,
John Osei Sekyere,
Usha Govinden,
Hafizah Y. Chenia,
Gunnar Skov Simonsen
et al.:
β-lactam and fluoroquinolone resistance in Enterobacteriaceae from imported and locally-produced chicken in Mozambique
Fredrik Håkonsholm,
Marit Andrea Klokkhammer Hetland,
Cecilie Smith Svanevik,
Arnfinn Sundsfjord,
Bjørn Tore Lunestad,
Nachiket Marathe
:
Antibiotic sensitivity screening of Klebsiella spp. and Raoultella spp. isolated from marine bivalve molluscs reveal presence of CTX-M-producing K. pneumoniae
Veronika Vorobieva,
Anne-Sofie Furberg,
Hans-Christian Slotved,
Tatiana Bazhukova,
Bjørg Haldorsen,
Dominique A Caugant
et al.:
Epidemiological and molecular characterization of Streptococcus pneumoniae carriage strains in pre-school children in Arkhangelsk, northern European Russia, prior to the introduction of conjugate pneumococcal vaccines
Alison Holmes,
Mark Holmes,
Thomas Gottlieb,
Lance B Price,
Arnfinn Sundsfjord
:
End non-essential use of antimicrobials in livestock
The BMJ 2019 DOI
Ørjan Samuelsen,
Arnfinn Sundsfjord,
Miriam Sare,
Ragnhild Raastad,
Nina Handal
:
Karbapenem-resistente Enterobacterales i Norge: Epidemiologi, spredning og tiltak
Folkehelseinstituttet 2025 ARKIV
Miriam Sare,
Ørjan Samuelsen,
Niclas Peter Raffelsberger,
Arnfinn Ståle Sundsfjord,
Iren Høyland Löhr,
Aasmund Fostervold
et al.:
Risikovurdering av hypervirulente Klebsiella pneumoniae i Norge : en norsk risikovurdering av ECDC sin Rapid Risk Assessment "Emergence of hypervirulent Klebsiella pneumoniae ST23 carrying carbapenemase genes in EU/EEA countries, first update"
Folkehelseinstituttet 2024 ARKIV
Maria Mellemstrand Grønmo,
Janne Møller-Stray,
Per Espen Akselsen,
Paul Christoffer Lindemann,
Aasmund Fostervold,
Caroline Vestby Knudsen
et al.:
Gentamicin bør fortsatt inngå i empirisk sepsisregime hos voksne
Morten Lindbæk,
Arnfinn Ståle Sundsfjord
:
Improving antibiotic prescribing for uncomplicated UTIs
The BMJ 2023 DOI
Fredrik Håkonsholm,
Arnfinn Sundsfjord,
Cecilie Smith Svanevik,
Bjørn Tore Lunestad,
Nachiket Marathe
:
Klebsiella pneumoniae in the marine setting – a challenge for seafood safety?
2023
Marit Hetland,
Mia Angelique Winkler,
Thomas D Stanton,
Ryan R. Wick,
Margaret MC Lam,
Aasmund Fostervold
et al.:
Klebsiella pneumoniae ecology and antimicrobial resistance in a One Health perspective
2023
Klara Stensvåg,
Arnfinn Sundsfjord,
Pål Jarle Johnsen,
Hanna-Kirsti S. Leiros,
Lise Nordgård
:
CANS - Centre for New Antibacterial Strategies
2022
Marit Hetland,
Jane Hawkey,
Eva Bernhoff,
Ragna-Johanne Bakksjø,
Håkon Kaspersen,
Siren Rettedal
et al.:
Within-patient and global evolutionary dynamics of Klebsiella pneumoniae ST17
2022
Theresa Wagner,
Jessin Janice James Peter,
Marc Schulz,
Susan A. Ballard,
Anders Goncalves da Silva,
Geoffrey W Coombs
et al.:
Australian vancomycin variable E. faecium ST1421 revert to resistance by the use of an alternative vanHAX promoter and increased vanA-plasmid copy number
2021
Bjørg C Haldorsen,
Erika Matuschek,
Jenny Åhman,
Gunnar Kahlmeter,
Arnfinn Sundsfjord,
Kristin Hegstad
:
Performance of the EUCAST disc diffusion method and gradient tests in detection of linezolid susceptibility in Enterococcus faecalis and Enterococcus faecium
2021
Yngvild Wasteson,
Henning Sørum,
Bjørn-Arne Lindstedt,
Adriana Dorota Osinska,
Arnfinn Sundsfjord,
Hans Geir Eiken
et al.:
CORNELIA – Antimicrobial Resistance (AMR) in One Health Interfaces
2021
Paul Christoffer Lindemann,
Karianne Wiger Gammelsrud,
Iren Høyland Löhr,
Per Espen Akselsen,
Morten Lindbæk,
Arnfinn Sundsfjord
:
Valg av antibiotika - viktig endring i prøvesvar fra mikrobiologen
2019 DOI
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Research interests
- Antimicrobials, antimicrobial resistance and evolution
- Klebsiella pneumoniae (Kp) is a key player in the global spread of antimicrobial resistance (AMR). Our studies involve comparative molecular epidemiological studies (whole genome sequencing and metagenomics), pheno- and genotypic associations in pathogenicity and antimicrobial susceptibility (GWAS and machine learning), as well as preclinical effectstudies of bacteriophages in the containment of carriage of and infections caused by multidrug resistant Kp. Kp-studies are funded by the Trond Mohn Foundation ( https://mohnfoundation.no/amr-prosjekter/) and partner institutions.
- Program director, Centre for New Antibacterial Strategies (CANS; https://uit.no/research/cans): En interdisiplinary research center funded by UiT and the Tromsø Research Foundation (https://tfstiftelse.no/) 2019-.
- Medical Director, National Norwegian Advisory Unit in Detection of Antimicrobial Resistance (K-res; https://unn.no/fag-og-forskning/k-res) at the University Hospital of North-Norway (UNN) funded by the Norwegian Ministry of Health, the Northern Regional Health Authority, and UNN.
Member of research group
Attachments:
- 20-01-16 CV_AS (pdf)