Academic article

• Smith, Marianne Hille; Rønning, Torunn Gresdal; Rettedal, Siren Irene et al. (2026). Methicillin-resistant Staphylococcus lugdunensis in a neonatal intensive care unit: diagnostic challenges and emergence of multidrug-resistance. (external link)
• Renz, Jessica; Dauda, Kazeem Adesina; Aga, Olav Nicolay Larsson et al. (2025). Evolutionary accumulation modeling in AMR: machine learning to infer and predict evolutionary dynamics of multi-drug resistance. (external link)
• Hetland, Marit; Winkler, Mia Angelique; Kaspersen, Håkon et al. (2025). A genome-wide One Health study of Klebsiella pneumoniae in Norway reveals overlapping populations but few recent transmission events across reservoirs. (external link)
• Ross, Theodor Anton; Janice, Jessin; Alonso, Sergio Arredondo et al. (2025). Enterococcus lactis is ecologically and genetically distinct from the major opportunistic pathogen Enterococcus faecium. (external link)
• Alonso, Sergio Arredondo; Pöntinen, Anna Kaarina; Gama, João Alves et al. (2025). Plasmid-driven strategies for clone success in Escherichia coli. (external link)
• Klingenberg, Claus Andreas; Justine, Museveni Ntwalibalilimba; Moyo, Sabrina John et al. (2025). Home administration of a multistrain probiotic once per day for 4 weeks to newborn infants in Tanzania (ProRIDE): a double-blind, placebo-controlled randomised trial. (external link)
• Taxt, Arne Michael; Eldholm, Vegard; Kols, Nicola Isabelle et al. (2025). A national outbreak of Serratia marcescens complex: investigation reveals genomic population structure but no source, Norway, June 2021 to February 2023. (external link)
• Hetland, Marit; Winkler, Mia Angelique; Kaspersen, Håkon et al. (2025). Complete genomes of 568 diverse Klebsiella pneumoniae species complex isolates from humans, animals, and marine sources in Norway from 2001 to 2020. (external link)
• Fostervold, Aasmund; Raffelsberger, Niclas Peter; Hetland, Marit et al. (2024). Risk of death in Klebsiella pneumoniae bloodstream infections is associated with specific phylogenetic lineages. (external link)
• Hetland, Marit; Hawkey, Jane; Bernhoff, Eva et al. (2023). Within-patient and global evolutionary dynamics of Klebsiella pneumoniae ST17. (external link)
• Kaspersen, Håkon; Franklin-Alming, Fiona Valerie; Hetland, Marit et al. (2023). Highly conserved composite transposon harbouring aerobactin iuc3 in Klebsiella pneumoniae from pigs. (external link)
• Krøvel, Anne Vatland; Hetland, Marit Andrea Klokkhammer; Bernhoff, Eva et al. (2023). Long-read sequencing for reliably calling the mompS allele in Legionella pneumophila sequence-based typing. (external link)
• Rubaye, Mushtaq al; Janice, Jessin; Bjørnholt, Jørgen Vildershøj et al. (2023). 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. (external link)
• Rubaye, Mushtaq Talib Shawi al; Janice, Jessin; Bjørnholt, Jørgen et al. (2023). The first vanE-type vancomycin resistant Enterococcus faecalis isolates in Norway – phenotypic and molecular characteristics. (external link)
• Kaspersen, Håkon; Urdahl, Anne Margrete; Franklin-Alming, Fiona Valerie et al. (2023). Population dynamics and characteristics of Klebsiella pneumoniae from healthy poultry in Norway. (external link)
• Raffelsberger, Niclas Peter; Buczek, Dorota Julia; Svendsen, Kristian et al. (2023). 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. (external link)
• Hetland, Marit; Bernhoff, Eva; Löhr, Iren Høyland et al. (2023). Long-read sequencing for reliably calling the mompS allele in Legionella pneumophila sequence-based typing. (external link)
• Ljungquist, Oskar; Haldorsen, Bjørg; Pöntinen, Anna Kaarina et al. (2023). Nationwide, population-based observational study of the molecular epidemiology and temporal trend of carbapenemase-producing Enterobacterales in Norway, 2015 to 2021. (external link)
• Håkonsholm, Fredrik; Hetland, Marit; Löhr, Iren Høyland et al. (2023). Co-localization of clinically relevant antibiotic- and heavy metal resistance genes on plasmids in Klebsiella pneumoniae from marine bivalves. (external link)
• Håkonsholm, Fredrik; Hetland, Marit Andrea Klokkhammer; Svanevik, Cecilie Smith et al. (2022). Insights into the genetic diversity, antibiotic resistance and pathogenic potential of Klebsiella pneumoniae from the Norwegian marine environment using whole-genome analysis. (external link)
• Syre, Heidi; Obreque, Marius Eduardo Brå; Dalen, Ingvild et al. (2022). The performances of three commercially available assays for the detection of SARS‐CoV‐2 antibodies at different time points following SARS‐CoV‐2 infection. (external link)
• Gravningen, Kirsten Midttun; Kacelnik, Oliver; Lingaas, Egil et al. (2022). Pseudomonas aeruginosa countrywide outbreak in hospitals linked to pre-moistened non-sterile washcloths, Norway, October 2021 to April 2022. (external link)
• Bernhoff, Eva; Löhr, Iren Høyland; Austerheim, Elin et al. (2022). Legionella pneumophila in Municipal Shower Systems in Stavanger, Norway; A Longitudinal Surveillance Study Using Whole Genome Sequencing in Risk Management. (external link)
• Krøvel, Anne Vatland; Bernhoff, Eva; Austerheim, Elin et al. (2022). Legionella pneumophila in Municipal Shower Systems in Stavanger, Norway; A Longitudinal Surveillance Study Using Whole Genome Sequencing in Risk Management. (external link)
• Kuwelker, Kanika; Langeland, Nina; Löhr, Iren Høyland et al. (2021). Use of probiotics to reduce infections and death and prevent colonization with extended-spectrum beta-lactamase (ESBL)-producing bacteria among newborn infants in Tanzania (ProRIDE Trial): study protocol for a randomized controlled clinical trial. (external link)
• Franklin-Alming, Fiona Valerie; Kaspersen, Håkon; Hetland, Marit Andrea Klokkhammer et al. (2021). Exploring Klebsiella pneumoniae in Healthy Poultry Reveals High Genetic Diversity, Good Biofilm-Forming Abilities and Higher Prevalence in Turkeys Than Broilers. (external link)
• Gladstone, Rebecca Ashley; McNally, Alan; Pöntinen, Anna Kaarina et al. (2021). Emergence and dissemination of antimicrobial resistance in Escherichia coli causing bloodstream infections in Norway in 2002–17: a nationwide, longitudinal, microbial population genomic study. (external link)
• Raffelsberger, Niclas Peter; Hetland, Marit Andrea Klokkhammer; Svendsen, Kristian et al. (2021). Gastrointestinal carriage of Klebsiella pneumoniae in a general adult population: a cross-sectional study of risk factors and bacterial genomic diversity. (external link)
• Ekelund, Oskar; Hetland, Marit Andrea Klokkhammer; Löhr, Iren Høyland et al. (2021). Rapid high-resolution detection of colistin resistance in Gram-negative bacteria using flow cytometry: A comparison with broth microdilution, a commercial screening test and WGS. (external link)
• Fostervold, Aasmund; Hetland, Marit Andrea Klokkhammer; Bakksjø, Ragna-Johanne et al. (2021). A nationwide genomic study of clinical Klebsiella pneumoniae in Norway 2001–15: introduction and spread of ESBLs facilitated by clonal groups CG15 and CG307. (external link)
• Wyres, Kelly L.; Hawkey, Jane; Hetland, Marit et al. (2019). Emergence and rapid global dissemination of CTX-M-15-associated Klebsiella pneumoniae strain ST307. (external link)
• Syre, Heidi; Hetland, Marit; Bernhoff, Eva et al. (2019). Microbial risk factors for treatment failure of pivmecillinam in community‐acquired urinary tract infections caused by ESBL‐producing Escherichia coli. (external link)
• Lam, Margaret M.C.; Wyres, Kelly L.; Wick, Ryan R. et al. (2019). Convergence of virulence and MDR in a single plasmid vector in MDR Klebsiella pneumoniae ST15. (external link)
• Natås, Olav Bjarte; Brekken, Anita Løvås; Bernhoff, Eva et al. (2019). Susceptibility of Legionella pneumophila to antimicrobial agents and the presence of the efflux pump LpeAB. (external link)
• Haldorsen, Bjørg; Giske, Christian G; Hansen, Dennis S et al. (2018). Performance of the EUCAST disc diffusion method and two MIC methods in detection of Enterobacteriaceae with reduced susceptibility to meropenem: the NordicAST CPE study.. (external link)
• Berg, Einar Sverre; Wester, Astrid Lousie; Ahrenfeldt, J et al. (2017). Norwegian patients and retail chicken meat share cephalosporin-resistant Escherichia coli and IncK/blaCMY-2 resistance plasmids. (external link)
• Löhr, Iren Høyland; Hülter, Nils Fredrik; Bernhoff, Eva et al. (2015). Persistence of a pKPN3-like CTX-M-15-encoding IncFIIK plasmid in a Klebsiella pneumonia ST17 host during two years of intestinal colonization. (external link)
• Rettedal, Siren; Löhr, Iren Høyland; Bernhoff, Eva et al. (2015). Extended-spectrum β-lactamase-producing Enterobacteriaceae among pregnant women in Norway: Prevalence and maternal-neonatal transmission. (external link)
• Löhr, Iren Høyland; Rettedal, Siren; Natås, Olav Bjarte et al. (2013). Long-term faecal carriage in infants and intra-household transmission of CTX-M-15-producing Klebsiella pneumoniae following a nosocomial outbreak. (external link)
• Rettedal, Siren; Löhr, Iren Høyland; Natås, Olav Bjarte et al. (2013). Risk factors for acquisition of CTX-M-15 extended-spectrum beta-lactamase-producing Klebsiella pneumoniae during an outbreak in a neonatal intensive care unit in Norway. (external link)
• Rettedal, Siren; Löhr, Iren Høyland; Natås, Olav Bjarte et al. (2012). First outbreak of extended-spectrum beta-lactamase-producing Klebsiella pneumoniae in a Norwegian neonatal intensive care unit; associated with contaminated breast milk and resolved by strict cohorting. (external link)
• Naaber, Paul; Stsepetova, Jelena; Smidt, Imbi et al. (2011). Quantification of Clostridium difficile in Antibiotic-Associated-Diarrhea Patients. (external link)
• Sepp, Epp; Stsepetova, Jelena; Smidt, Imbi et al. (2011). Intestinal lactoflora in Estonian and Norwegian patients with antibiotic associated diarrhea. (external link)

Report

• Sare, Miriam; Samuelsen, Ørjan; Raffelsberger, Niclas Peter et al. (2024). 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". (external link)

Poster

• Krøvel, Anne Vatland; Obreque, Marius Eduardo Brå; Syre, Heidi et al. (2024). Improving the first line diagnostics of Legionnaires’ disease using the LIAISON Legionella Urinary Ag kit. (external link)
• Hetland, Marit; Bjørheim, Anna Steensen; Bernhoff, Eva et al. (2023). ONTmompS - a tool for in silico sequence-based typing (SBT) of Legionella pneumophila completed genomes. (external link)
• Hetland, Marit; Bjørheim, Anna Steensen; Bernhoff, Eva et al. (2023). Legionella pneumophila sequence-based typing: lessons learned in the transition from Sanger- to whole-genome sequencing. (external link)
• Al-Rubaye, Mushtaq Talib Shawi; Janice, Jessin; Löhr, Iren Høyland et al. (2019). THE FIRST VANE VANCOMYCIN RESISTANT ENTEROCOCCUS FAECALIS IN NORWAY. (external link)
• Berhoff, Eva; Löhr, Iren Høyland; Lindemann, PC et al. (2018). Genomic analyses reveal dissemination of an Enterococcus faecium ST117 strain, containing a vanB Tn1549 integrated at the same site in the chromosome, in three hospitals in Western Norway. (external link)
• Berg, Einar Sverre; Wester, Astrid Lousie; Mo, Solveig Sølverød et al. (2015). Highly similar cephalosporin resistant Escherichia coli and AmpC resistance plasmids found in both patients and poultry meat in Norway. (external link)

Academic literature review

• Tsang, Kara K.; Lam, Margaret M C; Wick, Ryan R. et al. (2024). Diversity, functional classification and genotyping of SHV β-lactamases in Klebsiella pneumoniae. (external link)

Academic lecture

• Hetland, Marit; Winkler, Mia Angelique; Stanton, Thomas D et al. (2023). Klebsiella pneumoniae ecology and antimicrobial resistance in a One Health perspective. (external link)
• Hetland, Marit; Hawkey, Jane; Bernhoff, Eva et al. (2022). Within-patient and global evolutionary dynamics of Klebsiella pneumoniae ST17. (external link)

Reader opinion piece

• Ulvestad, Elling; Kommedal, Øyvind; Simonsen, Gunnar Skov et al. (2020). Norges mikrobiologiske utbruddsberedskap er truet. (external link)

Feature article

• Lindemann, Paul Christoffer; Gammelsrud, Karianne Wiger; Löhr, Iren Høyland et al. (2019). Valg av antibiotika - viktig endring i prøvesvar fra mikrobiologen. (external link)

Doctoral dissertation

• Löhr, Iren Høyland (2014). Extended-spectrum β-lactamase producing Klebsiella pneumoniae. A neonatal intensive care unit outbreak, long-term colonization in children and plasmid characteristics. (external link)

See a complete overview of publications in Cristin.