Personkort bilde
Professor

Kristin Hegstad

Professor Department of Medical Biology
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Main research topics: Antimicrobial resistance - Mobile genetic elements and horizontal gene transfer of antimicrobial resistance - Mechanisms for antimicrobial resistance - Detection of antimicrobial resistance - Novel virulence factors as targets for disarmament of pathogens - Membrane vesicles

Member of Centre for New Antibacterial Strategies (CANS)

Main research project: New strategies to combat multidrug resistant enterococci

Infections caused by multi-resistant bacteria are very difficult to treat and pose a serious threat to human health as well as medical advances. Enterococcus faecium is a leading cause of nosocomial infections, especially in severely ill and immunocompromised patients. Vancomycin resistant E. faecium is ranked as number four on the WHO’s priority pathogens list in antimicrobial research and development due to public health concerns. While in Norway only 0-10 cases of Vancomycin Resistant Enterococci (VRE) were reported annually before 2010, this number increased to 384 in 2017. Novel therapeutic approaches and alternatives for infection control are desperately needed to combat VRE.

Sub-projects
1. The Norwegian VRE study. The aims of this study are to gain new insights in to the spread of antimicrobial resistance in enterococci, identify new targets for antimicrobial treatment and containment of infections caused by multidrug resistant enterococci, and define novel infection control interventions for VRE. The study takes advantage of an on-going national epidemiological study of VRE in Norway and will use collections of non-VRE isolates from the Norsk Overvåkningssystem for antibiotikaResistens hos Mikrober (NORM) registry and from a general population sample (Tromsø 7). Combining clinical epidemiological information about the VREs and genomic data from the different strain collections we can identify determinants best suited for anti-virulence targeting of E. faecium, reveal unknown transmission patterns and de novo generation of VRE as well as relate the Norwegian epidemiology to the global epidemiology of VRE.

2. Alternative Strategies to Combat VRE. With this project we aim to find treatment alternatives in the fight against E. faecium infections, to lead way for novel therapy and eventually slow down the increase of VRE incidences in Norway. First, immunization with MVs derived from E. faecium is a promising alternative for prevention and/ or treatment of enterococcal infections. Second, by exploring mobile genetic elements as putative modes of dissemination of resistance gene, we will gain knowledge, which will help to find target points to interfere with the spread of resistance genes. Third, investigating the interactions of commensal and nosocomial E. faecium will help our understanding of VRE and their contribution to dysbiosis. Overall, this project provides knowledge to develop novel drugs against VRE, which are urgently needed to shorten hospital stay, infection associated costs and discomforts.

Education

  • 2000 : PhD degree in Medical Microbiology – University of Tromsø
  • 1995 : Master degree in Marine biotechnology/microbiology – Norwegian Fishery College

Employment

  • Since 2004: Research Scientist, Norwegian National Advisory Unit on Detection of Antimicrobial Resistance, University Hospital of North Norway, Tromsø
  • Since 2017: Professor II, Research group of Host Microbe Interaction, Dept. of Medical Biology, UiT – The Arctic University of Norway, Tromsø
  • 2008-2010 + 2015-2017: Section manager, Norwegian National Advisory Unit on Detection of Antimicrobial Resistance, Dept. of Microbiology and Infection Control, University Hospital of North Norway, Tromsø.
  • 2006 - 2016: Associate Professor II, Dept. of Medical Biology, University of Tromsø
  • 2001 - 2004: Post-doctoral position, Dept. of Medical Biology, University of Tromsø
  • May 2001 - May 2002: Post-doctoral position/visiting Research Fellow, Patrice Courvalin lab, Unité des Agents Antibactériens, Institut Pasteur, Paris, France.

  • Sivertsen, Audun; Pedersen, Torunn Annie; Larssen, Kjersti Wik; Bergh, Kåre; Rønning, Torunn Gresdal; Radtke, Andreas; Hegstad, Kristin. Silenced vanA gene cluster on a transferable plasmid cause outbreak of vancomycin variable enterococci. Antimicrobial Agents and Chemotherapy 2016; Volum 60 (7). ISSN 0066-4804.s 4119 - 4127.s doi: 10.1128/AAC.00286-16.
  • Freitas, A; Tedim, A; Francia, Maria V.; Jensen, Lars B; Novais, C; Peixe, L; Sánchez-Valenzuela, A; Sundsfjord, Arnfinn; Hegstad, Kristin; Werner, Guido; Sadowy, Ewa; Hammerum, Anette M.; Garcia-Migura, Lourdes; Willems, Rob J; Baquero, Fernando; Coque, Teresa M.. Multilevel population genetic analysis of vanA and vanB Enterococcus faecium causing nosocomial outbreaks in 27 countries (1986-2012). Journal of Antimicrobial Chemotherapy 2016; Volum 71. ISSN 0305-7453.s 3351 - 3366.s doi: 10.1093/jac/dkw312.
  • Thilesen, Carina Merethe; Bjørang, Ola; Skrede, Thomas; Aronsen, Tommy; AasnÆs, bettina; Sundsfjord, Arnfinn; Hegstad, Kristin. Emergence of mutation-based linezolid-resistant invasive Enterococcus faecalis in a haemodialysis patient in Norway. APMIS - Journal of Pathologiy, Microbiology and Immunology 2014; Volum 122 (1). ISSN 0903-4641.s 83 - 84.s doi: 10.1111/apm.12100.
  • Sivertsen, Audun; Billström, Hanna; Melefors, Öjar; Liljequist, Barbro Olsson; Wisell, Karin Tegmark; Ullberg, Måns; Özenci, Volkan; Sundsfjord, Arnfinn; Hegstad, Kristin. A multicentre hospital outbreak in Sweden caused by introduction of a vanB2 transposon into a stably maintained pRUM-plasmid in an Enterococcus faecium ST192 clone. PLOS ONE 2014; Volum 9:e0103274 (8). ISSN 1932-6203.s doi: 10.1371/journal.pone.0103274.
  • Hegstad, Kristin; Giske, Christian G.; Haldorsen, Bjørg; Matuschek, Erika; Schønning, Kristian; Leegaard, Truls Michael; Kahlmeter, Gunnar; Sundsfjord, Arnfinn. Performance of the EUCAST disk diffusion method, the CLSI agar screen method, and the Vitek 2 automated antimicrobial susceptibility testing system for detection of clinical isolates of enterococci with low- and medium-level VanB-type vancomycin resistance: A multicenter study. Journal of Clinical Microbiology 2014; Volum 52 (5). ISSN 0095-1137.s 1582 - 1589.s doi: 10.1128/JCM.03544-13.
  • Werner, Guido; Coque, Teresa M.; Franz, Charles M.A.P.; Grohmann, Elisabeth; Hegstad, Kristin; Jensen, Lars; van Schaik, Willem; Weaver, Keith. Antibiotic resistant enterococci-Tales of a drug resistance gene trafficker. International Journal of Medical Microbiology 2013; Volum 303 (6-7). ISSN 1438-4221.s 360 - 379.s doi: 10.1016/j.ijmm.2013.03.001.
  • Tofteland, Ståle; Hegstad, Kristin; AasnÆs, bettina; Sundsfjord, Arnfinn; Naseer, Mohammed Umaer. A nationwide study of mechanisms conferring reduced susceptibility to extended-spectrum cephalosporins in clinical Escherichia coli and Klebsiella spp. isolates. Scandinavian Journal of Infectious Diseases 2012; Volum 44 (12). ISSN 0036-5548.s 927 - 933.s doi: 10.3109/00365548.2012.707330.
  • Bjørkeng, Eva katrin; Rasmussen, Gunlög; Sundsfjord, Arnfinn; Sjøberg, Lennart; Hegstad, Kristin; Söderquist, Bo. Clustering of polyclonal VanB-type vancomycin-resistant Enterococcus faecium in a low-endemic area was associated with CC17-genogroup strains harbouring transferable vanB2-Tn5382 and pRUM-like repA containing plasmids with axe-txe plasmid addiction systems. APMIS - Journal of Pathologiy, Microbiology and Immunology 2011; Volum 119 (4-5). ISSN 0903-4641.s 247 - 258.s doi: 10.1111/j.1600-0463.2011.02724.x.
  • Hegstad, Kristin; Langsrud, Solveig; Lunestad, Bjørn Tore; Scheie, Anne Aamdal; Sunde, Marianne; Yazdankhah, Siamak Pour. Does the wide use of quaternary ammonium compounds enhance the selection and spread of antimicrobial resistance and thus threaten our health?. Microbial Drug Resistance 2010; Volum 16 (2). ISSN 1076-6294.s 91 - 104.s doi: 10.1089/mdr.2009.0120.
  • Naseer, Umaer; Haldorsen, Bjørg; Haldorsen, Bjørg; Tofteland, Ståle; Hegstad, Kristin; Scheutz, Flemming; Simonsen, Gunnar Skov; Sundsfjord, Arnfinn. Molecular characterization of CTX-M-15-producing clinical isolates of Escherichia coli reveals the spread of multidrug-resistant ST131 (O25:H4) and ST964 (O102:H6) strains in Norway. APMIS - Journal of Pathologiy, Microbiology and Immunology 2009; Volum 117 (7). ISSN 0903-4641.s 526 - 536.s doi: 10.1111/j.1600-0463.2009.02465.x.
  • Dahl, Kristin Hegstad; Mater, DDG; Flores, MJ; Johnsen, Pål jarle; Midtvedt, T; Corthier, G; Sundsfjord, arnfinn. Transfer of plasmid and chromosomal glycopeptide resistance determinants occurs more readily in the digestive tract of mice than in vitro and exconjugants can persist stably in vivo in the absence of glycopeptide selection. Journal of Antimicrobial Chemotherapy 2007; Volum 59. ISSN 0305-7453.s doi: 10.1093/jac/dkl530.
  • Tofteland, Ståle; Haldorsen, Bjørg; Dahl, Kristin Hegstad; Simonsen, Gunnar Skov; Steinbakk, Martin; Walsh, Timothy R; Sundsfjord, Arnfinn. Effects of phenotype and genotype on methods for detection of extended-spectrum-beta-lactamase-producing clinical isolates of Escherichia coli and Klebsiella pneumoniae in Norway. (Fulltekst: http://jcm.asm.org/cgi/reprint/45/1/199?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&author1=sundsfjord%2C+a&searchid=1&FIRSTINDEX=0&volume=45&resourcetype=HWCIT Journal of Clinical Microbiology 2007; Volum 45 (1). ISSN 0095-1137.s 199 - 205.s doi: 10.1128/JCM.01319-06.
  • Werner, Guido; Dahl, kristin hegstad; Willems, Rob J. Composite elements encoding antibiotic resistance in Enterococcus faecium and Enterococcus faecalis. 2006 ISBN 81-7736-290-9.s 157 - 209.
  • Sundsfjord, Arnfinn; Simonsen, Gunnar Skov; Haldorsen, Bjørg C; Haaheim, Håkon; Hjelmevoll, SO; Littauer, Pia; Dahl, Kristin Hegstad. Genetic methods for detection of antimicrobial resistance. APMIS - Journal of Pathologiy, Microbiology and Immunology 2004; Volum 112. ISSN 0903-4641.s 815 - 837.
  • Dahl, Kristin Hegstad; Sundsfjord, Arnfinn. Transferable vanB2-Tn5382-Like Containing Elements in Fecal Streptococcal Strains From Veal Calf. Antimicrobial Agents and Chemotherapy 2003; Volum 47. ISSN 0066-4804.s 2579 - 2583.
  • Joshi, Bishnu; Singh, Bhupender; Nadeem, Aftab; Askarian, Fatemeh; Wai, Sun Nyunt; Johannessen, Mona; Hegstad, Kristin. Transcriptome profiling of staphylococcus aureus associated extracellular vesicles reveals presence of small RNA-cargo. Frontiers in Molecular Biosciences 2021; Volum 7:566207. ISSN 2296-889X.s 1 - 16.s doi: 10.3389/fmolb.2020.566207.

  • Hegstad, Kristin; Mylvaganam, Haima; Janice, Jessin; Josefsen, Ellen Haldis; Sivertsen, Audun; Skaare, Dagfinn. Role of Horizontal Gene Transfer in the Development of Multidrug Resistance in Haemophilus influenzae. (Fulltekst: https://msphere.asm.org/content/msph/5/1/e00969-19.full.pdf mSphere 2020; Volum 5 (1). ISSN 2379-5042.s doi: 10.1128/mSphere.00969-19.

  • Wagner, Theresa; Janice, Jessin; Sivertsen, Audun; Sjögren, Ingegerd; Sundsfjord, Arnfinn; Hegstad, Kristin. Alternative vanHAX promoters and increased vanA-plasmid copy number resurrect silenced glycopeptide resistance in Enterococcus faecium. Journal of Antimicrobial Chemotherapy 2020. ISSN 0305-7453.s doi: 10.1093/jac/dkaa541.

  • Elstrøm, Petter; Astrup, Elisabeth; Hegstad, Kristin; Samuelsen, Ørjan; Enger, Hege; Kacelnik, Oliver. 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. PLOS ONE 2019; Volum 14:e0211741 (2). ISSN 1932-6203.s 1 - 17.s doi: 10.1371/journal.pone.0211741.

  • Bender, Jennifer; Cattoir, Vincent; Hegstad, Kristin; Sadowy, Eva; Coque, Teresa M.; Westh, Henrik; Hammerum, Anette M.; Schaffer, Kirsten; Burns, Karen; Murchan, Stephen; Novais, Carla; Freitas, Ana R.; Peixe, Luísa; Del Grosso, Maria; Pantosti, Annalisa; Werner, Guido. Update on prevalence and mechanisms of resistance to linezolid, tigecycline and daptomycin in enterococci in Europe: towards a common nomenclature.. Drug resistance updates 2018; Volum 40. ISSN 1368-7646.s 25 - 39.s doi: 10.1016/j.drup.2018.10.002.

  • Wagner, Theresa; James Peter, Jessin Janice; Paganelli, Fernanda; Willems, Rob J.L.; Askarian, Fatemeh; Pedersen, Torunn Annie; Top, Janetta; de Haas, Carla; van strijp, Jos A. G.; Johannessen, Mona; Hegstad, Kristin. Enterococcus faecium TIR-Domain Genes Are Part of a Gene Cluster Which Promotes Bacterial Survival in Blood. International Journal of Microbiology 2018; Volum 2018. ISSN 1687-918X.s doi: 10.1155/2018/1435820.

  • Sivertsen, Audun; James Peter, Jessin Janice; Pedersen, Torunn Annie; Wagner, Theresa; Hegstad, Joachim; Hegstad, Kristin. The enterococcus cassette chromosome, a genomic variation enabler in enterococci. mSphere 2018; Volum 3:e00402-18 (6). ISSN 2379-5042.s 1 - 13.s doi: 10.1128/mSphere.00402-18.

  • Wagner, Theresa; Joshi, Bishnu; James Peter, Jessin Janice; Askarian, Fatemeh; Skalko-Basnet, Natasa; Hagestad, Ole Christian; Mekhlif, Ahmed; Wai, Sun Nyunt; Hegstad, Kristin; Johannessen, Mona. Enterococcus faecium produces membrane vesicles containing virulence factors and antimicrobial resistance related proteins. Journal of Proteomics 2018. ISSN 1874-3919.s doi: 10.1016/j.jprot.2018.05.017.

  • Sivertsen, Audun; Pedersen, Torunn Annie; Larssen, Kjersti Wik; Bergh, Kåre; Rønning, Torunn Gresdal; Radtke, Andreas; Hegstad, Kristin. Silenced vanA gene cluster on a transferable plasmid cause outbreak of vancomycin variable enterococci. Antimicrobial Agents and Chemotherapy 2016; Volum 60 (7). ISSN 0066-4804.s 4119 - 4127.s doi: 10.1128/AAC.00286-16.

  • Freitas, A; Tedim, A; Francia, Maria V.; Jensen, Lars B; Novais, C; Peixe, L; Sánchez-Valenzuela, A; Sundsfjord, Arnfinn; Hegstad, Kristin; Werner, Guido; Sadowy, Ewa; Hammerum, Anette M.; Garcia-Migura, Lourdes; Willems, Rob J; Baquero, Fernando; Coque, Teresa M.. Multilevel population genetic analysis of vanA and vanB Enterococcus faecium causing nosocomial outbreaks in 27 countries (1986-2012). Journal of Antimicrobial Chemotherapy 2016; Volum 71. ISSN 0305-7453.s 3351 - 3366.s doi: 10.1093/jac/dkw312.

  • Mikalsen, Theresa; Pedersen, Torunn Annie; Willems, Rob; Coque, Teresa M.; Werner, Guido; Sadowy, Ewa; van Schaik, Willem; Jensen, Lars Bogø; Sundsfjord, Arnfinn; Hegstad, Kristin. Investigating the mobilome in clinically important lineages of enterococcus faecium and enterococcus faecalis. BMC Genomics 2015; Volum 16:282. ISSN 1471-2164.s doi: 10.1186/s12864-015-1407-6.

  • Hegstad, Kristin; Longva, Jørn-Åge; Hide, Reidar; Aasnæs, Bettina; Lunde, Tracy Tamara Munthali; Simonsen, Gunnar Skov. Cluster of linezolid-resistant Enterococcus faecium ST117 in Norwegian hospitals. Scandinavian Journal of Infectious Diseases 2014; Volum 46 (10). ISSN 0036-5548.s 712 - 715.s doi: 10.3109/00365548.2014.923107.

  • Sivertsen, Audun; Billström, Hanna; Melefors, Öjar; Liljequist, Barbro Olsson; Wisell, Karin Tegmark; Ullberg, Måns; Özenci, Volkan; Sundsfjord, Arnfinn; Hegstad, Kristin. A multicentre hospital outbreak in Sweden caused by introduction of a vanB2 transposon into a stably maintained pRUM-plasmid in an Enterococcus faecium ST192 clone. PLOS ONE 2014; Volum 9:e0103274 (8). ISSN 1932-6203.s doi: 10.1371/journal.pone.0103274.

  • Hegstad, Kristin; Giske, Christian G.; Haldorsen, Bjørg; Matuschek, Erika; Schønning, Kristian; Leegaard, Truls Michael; Kahlmeter, Gunnar; Sundsfjord, Arnfinn. Performance of the EUCAST disk diffusion method, the CLSI agar screen method, and the Vitek 2 automated antimicrobial susceptibility testing system for detection of clinical isolates of enterococci with low- and medium-level VanB-type vancomycin resistance: A multicenter study. Journal of Clinical Microbiology 2014; Volum 52 (5). ISSN 0095-1137.s 1582 - 1589.s doi: 10.1128/JCM.03544-13.

  • Werner, Guido; Coque, Teresa M.; Franz, Charles M.A.P.; Grohmann, Elisabeth; Hegstad, Kristin; Jensen, Lars; van Schaik, Willem; Weaver, Keith. Antibiotic resistant enterococci-Tales of a drug resistance gene trafficker. International Journal of Medical Microbiology 2013; Volum 303 (6-7). ISSN 1438-4221.s 360 - 379.s doi: 10.1016/j.ijmm.2013.03.001.

  • Bjørkeng, Eva katrin; Hjerde, Erik; Pedersen, Torunn; Sundsfjord, Arnfinn; Hegstad, Kristin. ICESluvan, a 94-Kilobase Mosaic Integrative Conjugative Element Conferring Interspecies Transfer of VanB-Type Glycopeptide Resistance, a Novel Bacitracin Resistance Locus, and a ToxinAntitoxin Stabilization System. Journal of Bacteriology 2013; Volum 195 (23). ISSN 0021-9193.s 5381 - 5390.s doi: 10.1128/JB.02165-12.

  • Tofteland, Ståle; Hegstad, Kristin; AasnÆs, bettina; Sundsfjord, Arnfinn; Naseer, Mohammed Umaer. A nationwide study of mechanisms conferring reduced susceptibility to extended-spectrum cephalosporins in clinical Escherichia coli and Klebsiella spp. isolates. Scandinavian Journal of Infectious Diseases 2012; Volum 44 (12). ISSN 0036-5548.s 927 - 933.s doi: 10.3109/00365548.2012.707330.

  • Rosvoll, Torill Cathrin Solvær; Langnes, Belinda; Lunde, Tracy Munthali; Hegstad, Kristin; AasnÆs, bettina; Hammerum, Anette M.; Lester, Camilla; Simonsen, Gunnar Skov; Sundsfjord, Arnfinn; Pedersen, Torunn. Increased high-level gentamicin resistance in invasive Enterococcus faecium is associated with aac(6 ')Ie-aph(2 '')Ia-encoding transferable megaplasmids hosted by major hospital-adapted lineages. FEMS Immunology and Medical Microbiology 2012; Volum 66 (2). ISSN 0928-8244.s 166 - 176.s doi: 10.1111/j.1574-695X.2012.00997.x.

  • Bjørkeng, Eva katrin; Rasmussen, Gunlög; Sundsfjord, Arnfinn; Sjøberg, Lennart; Hegstad, Kristin; Söderquist, Bo. Clustering of polyclonal VanB-type vancomycin-resistant Enterococcus faecium in a low-endemic area was associated with CC17-genogroup strains harbouring transferable vanB2-Tn5382 and pRUM-like repA containing plasmids with axe-txe plasmid addiction systems. APMIS - Journal of Pathologiy, Microbiology and Immunology 2011; Volum 119 (4-5). ISSN 0903-4641.s 247 - 258.s doi: 10.1111/j.1600-0463.2011.02724.x.

  • Karah, Nabil; Haldorsen, Bjørg; Hegstad, Kristin; Simonsen, Gunnar Skov; Sundsfjord, Arnfinn; Samuelsen, Ørjan. Species identification and molecular characterization of Acinetobacter spp. blood culture isolates from Norway. Journal of Antimicrobial Chemotherapy 2011; Volum 66 (4). ISSN 0305-7453.s 738 - 744.s doi: 10.1093/jac/dkq521.

  • Hegstad, Kristin; Langsrud, Solveig; Lunestad, Bjørn Tore; Scheie, Anne Aamdal; Sunde, Marianne; Yazdankhah, Siamak Pour. Does the wide use of quaternary ammonium compounds enhance the selection and spread of antimicrobial resistance and thus threaten our health?. Microbial Drug Resistance 2010; Volum 16 (2). ISSN 1076-6294.s 91 - 104.s doi: 10.1089/mdr.2009.0120.

  • Hegstad, Kristin; Mikalsen, Theresa; Coque, T.M.; Werner, G; Sundsfjord, Arnfinn. Mobile genetic elements and their contribution to the emergence of antimicrobial resistant Enterococcus faecalis and Enterococcus faecium. Clinical Microbiology and Infection (CMI) 2010; Volum 16 (6). ISSN 1198-743X.s 541 - 554.s doi: 10.1111/j.1469-0691.2010.03226.x.

  • Bjørkeng, Eva Katrin; Tessema, Girum Tadesse; Lundblad, Eirik Wasmuth; Butaye, Patrick; Willems, Rob J; Sollid, Johanna Ericsson; Sundsfjord, Arnfinn; Hegstad, Kristin. ccrABEnt serine recombinase genes are widely distributed in the Enterococcus faecium and Enterococcus casseliflavus species groups and are widely expressed in E. faecium. Microbiology (Reading) 2010; Volum 156. ISSN 1350-0872.s 3624 - 3634.s doi: 10.1099/mic.0.041491-0.

  • Naseer, Umaer; Haldorsen, Bjørg; Haldorsen, Bjørg; Tofteland, Ståle; Hegstad, Kristin; Scheutz, Flemming; Simonsen, Gunnar Skov; Sundsfjord, Arnfinn. Molecular characterization of CTX-M-15-producing clinical isolates of Escherichia coli reveals the spread of multidrug-resistant ST131 (O25:H4) and ST964 (O102:H6) strains in Norway. APMIS - Journal of Pathologiy, Microbiology and Immunology 2009; Volum 117 (7). ISSN 0903-4641.s 526 - 536.s doi: 10.1111/j.1600-0463.2009.02465.x.

  • Haldorsen, Bjørg C; Aasnaes, Bettina; Dahl, Kristin Hegstad; Hanssen, Anne-Merethe; Simonsen, Gunnar Skov; Walsh, Timothy R; Sundsfjord, arnfinn; Lundblad, Eirik W. The AmpC phenotype in Norwegian clinical isolates of Escherichia coli is associated with an acquired ISEcp1-like ampC element or hyperproduction of the endogenous AmpC. Journal of Antimicrobial Chemotherapy 2008; Volum 62. ISSN 0305-7453.s 694 - 702.s doi: 10.1093/jac/dkn257.

  • Dahl, Kristin Hegstad; Mater, DDG; Flores, MJ; Johnsen, Pål jarle; Midtvedt, T; Corthier, G; Sundsfjord, arnfinn. Transfer of plasmid and chromosomal glycopeptide resistance determinants occurs more readily in the digestive tract of mice than in vitro and exconjugants can persist stably in vivo in the absence of glycopeptide selection. Journal of Antimicrobial Chemotherapy 2007; Volum 59. ISSN 0305-7453.s doi: 10.1093/jac/dkl530.

  • Tofteland, Ståle; Haldorsen, Bjørg; Dahl, Kristin Hegstad; Simonsen, Gunnar Skov; Steinbakk, Martin; Walsh, Timothy R; Sundsfjord, Arnfinn. Effects of phenotype and genotype on methods for detection of extended-spectrum-beta-lactamase-producing clinical isolates of Escherichia coli and Klebsiella pneumoniae in Norway. (Fulltekst: http://jcm.asm.org/cgi/reprint/45/1/199?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&author1=sundsfjord%2C+a&searchid=1&FIRSTINDEX=0&volume=45&resourcetype=HWCIT Journal of Clinical Microbiology 2007; Volum 45 (1). ISSN 0095-1137.s 199 - 205.s doi: 10.1128/JCM.01319-06.

  • Werner, Guido; Dahl, kristin hegstad; Willems, Rob J. Composite elements encoding antibiotic resistance in Enterococcus faecium and Enterococcus faecalis. 2006 ISBN 81-7736-290-9.s 157 - 209.

  • Sangvik, Maria; Littauer, Pia; Simonsen, Gunnar Skov; Sundsfjord, Arnfinn; Dahl, Kristin Hegstad. mef(A), mef(E) and a new mef allele in macrolide-resistant Streptococcus spp. isolates from Norway. Journal of Antimicrobial Chemotherapy 2005; Volum 56. ISSN 0305-7453.s 841 - 846.

  • Sundsfjord, Arnfinn; Simonsen, Gunnar Skov; Haldorsen, Bjørg C; Haaheim, Håkon; Hjelmevoll, SO; Littauer, Pia; Dahl, Kristin Hegstad. Genetic methods for detection of antimicrobial resistance. APMIS - Journal of Pathologiy, Microbiology and Immunology 2004; Volum 112. ISSN 0903-4641.s 815 - 837.

  • Dahl, Kristin Hegstad; Sundsfjord, Arnfinn. Transferable vanB2-Tn5382-Like Containing Elements in Fecal Streptococcal Strains From Veal Calf. Antimicrobial Agents and Chemotherapy 2003; Volum 47. ISSN 0066-4804.s 2579 - 2583.

  • Wagner, Theresa; Ajayi, Clement; Johannessen, Mona; Hegstad, Kristin; Grimnes, Gro; Hemmingsen, Ingrid. Brukermøte 2020. Brukerutvalg HN prosjekter 2020-03-02 - 2020-03-02 2020.

  • Wagner, Theresa; Johannessen, Mona; Hegstad, Kristin. Towards a vaccine based on enterococcal membrane vesicles. Optimmunize: Improving the beneficial effects of vaccines 2020-02-19 - 2020-02-21 2020.

  • Basic, A; Matuschek, Erika; Karatuna, O; Haldorsen, Bjørg C; Hegstad, Kristin; Åhman, Jenny; Sundsfjord, Arnfinn; Kahlmeter, Gunnar. Evaluation of gradient tests for vancomycin MIC determination in Enterococcus faecalis and Enterococcus faecium. Effect of incubation for 16-20 hours vs. 24 hours. 29th European Congress of Clinical Microbiology and Infectious Diseases 2019-04-13 - 2019-04-16 2019.

  • Hatlegjerde Fossan, Randi H; Hopperstad, Daniel; Haldorsen, Bjørg C; Hegstad, Kristin. Kan oksegalletilsetning i MH- og BHI-agar fremme fenotypisk påvisning av vanB-VRE med lavgradig vankomycin-MIC?. Bioingeniørkongressen 2019 2019-05-22 - 2019-05-24 2019.

  • Lindemann, Paul Christoffer; Haukeland, TS; Kolstad, H; Haldorsen, Bjørg C; Hegstad, Kristin. Antimicrobial susceptibility testing of Enterococcus spp. in a VanB-VRE outbreak setting. 36th Annual meeting of Nordic Society of Clinical Microbiology and Infectious Diseases 2019-09-12 - 2019-09-15 2019.

  • James Peter, Jessin Janice; Hegstad, Joachim; Josefsen, Ellen H.; Sundsfjord, Arnfinn; Hegstad, Kristin. Increased prevalence of linezolid resistance mong clinical enterococci in Norway mainly due to spread of optrA E. faecalis. 12th International Meeting on Microbial Epidemiological Markers 2019-09-18 - 2019-09-21 2019.

  • Nygaard, Randi Monsen; Hegstad, Kristin; Kommedal, Øyvind; Lindemann, Paul Christoffer. High prevalence of vanB in non-enterococcal flora including a novel species contributes to persistent outbreaks of vancomycin resistant enterococci in a Norwegian hospital. 12th International Meeting on Microbial Epidemiological Markers 2019-09-18 - 2019-09-21 2019.

  • Joshi, Bishnu; Wai, Sun Nyunt; Johannessen, Mona; Hegstad, Kristin. Extracellular vesicle -associated small RNA released by Staphylococcus aureus (MSSA476) grown under stress condition. 3rd annual IBA meeting 2019-11-04 - 2019-11-05 2019.

  • Wagner, Theresa; Johannessen, Mona; Hegstad, Kristin. Investigating the immune response towards enterococcal membrane vesicles.. IBA annual meeting 2019-11-04 - 2019-11-05 2019.

  • Wagner, Theresa; Ajayi, Clement; Hegstad, Kristin; Johannessen, Mona; Grimnes, Gro; Hemmingsen, Ingrid. Brukermøte 2019. Brukerutvalg HN prosjekter 2019-02-15 - 2019.

  • Al-Rubaye, Mushtaq Talib Shawi; Janice, Jessin; Löhr, Iren Høyland; Sundsfjord, Arnfinn; Hegstad, Kristin. THE FIRST VANE VANCOMYCIN RESISTANT ENTEROCOCCUS FAECALIS IN NORWAY. 3rd annual Iba school meeting 2019-11-03 - 2019-11-05 2019.

  • Al-Rubaye, Mushtaq Talib Shawi; Janice, Jessin; Vildershøj Bjørnholt, Jørgen; Kacelink, Oliver; Haldorsen, Biørg C.; Nygaard, Randi M.; Sundsfjord, Arnfinn; Hegstad, Kristin. POPULATION STRUCTURE OF THE NORWEGIAN VANCOMYCIN RESISTANT AND SENSITIVE ENTEROCOCCI 2010-2015. 3rd annual Iba school meeting 2019-11-03 - 2019-11-05 2019.

  • Wagner, Theresa; Johannessen, Mona; Hegstad, Kristin. Investigating the immune response towards enterococcal membrane vesicles. CEMIR 2019: The second Conference on Molecular Mechanisms of Inflammation 2019-06-03 - 2019-06-06 2019.

  • Wagner, Theresa; Janice, Jessin; Sivertsen, Audun; Sjögren, Ingegerd; Sundsfjord, Arnfinn; Hegstad, Kristin. The bag of tricks of vancomycin variable enterococci: an alternative constitutive vanHAX-promoter, varying copy numbers and transferable resistance. 12th International Meeting on Microbial Epidemiological Markers (IMMEM XII) 2019-09-18 - 2019-09-21 2019.

  • Wagner, Theresa; Joshi, Bishnu; Janice, Jessin; Paganelli, Fernanda; Willems, Rob; Askarian, Fatemeh; Skalko-Basnet, Natasa; Hagestad, Ole-Christian; Mekhlif, Ahmed; Wai, Sun Nyunt; Johannessen, Mona; Hegstad, Kristin. Virulence factors and antibiotic resistance related proteins are associated with membrane vesicles produced by clinically relevant Enterococcus faecium strains (poster). ICE, International Conference on Enterococci 2018-04-15 - 2018-04-19 2018.

  • Hegstad, Kristin. Vankomycinresistens hos enterokokker. Section meeting Department of microbiology, Haukeland University Hospital 2018-12-04 - 2018.

  • Hegstad, Kristin. Vankomycinresistente enterokokker – hvorfor er de så suksessfulle i sykehuset?. Online teaching Infection Control Norway 2018-05-09 - 2018.

  • Hegstad, Kristin. Hvorfor kan VRE være vanskelig å detektere i laboratoriet?. Infektionsveckan och Mikrobiologiskt Vårmöte i Karlstad 2018-05-29 - 2018-05-31 2018.

  • Berhoff, Eva; Löhr, Iren Høyland; Lindemann, PC; Hetland, MAK; James Peter, Jessin Janice; Hegstad, Kristin. 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. 28th European Congress of Clinical Microbiology and Infectious Diseases 2018-04-21 - 2018-04-24 2018.

  • James Peter, Jessin Janice; Josefsen, Ellen H.; Sundsfjord, Arnfinn; Hegstad, Kristin. Increased prevalence of linezolid resistance among clinical enterococci in Norway.. 5th International Conference on Enterococci 2018-04-15 - 2018-04-19 2018.

  • Wagner, Theresa; Hegstad, Kristin; Johannessen, Mona; Pedersen, Torunn Annie. How to Be a Bad Bug: Virulence Determinants of Enterococcus faecium. 2018 (2018) ISBN 978-82-7589-613-9.

  • Wagner, Theresa; Sivertsen, Audun; Janice, Jessin; Sjögren, Ingegerd; Sundsfjord, Arnfinn; Hegstad, Kristin. Vancomycin variable resistance may occur through creation of a novel constitutive vanHAX-promoter by illegitimate recombination. NDPIA/IBA course on “Antibiotics and Antibiotic Resistance” 2018-11-26 - 2018-11-30 2018.

  • Abel, Sören; Mahmutovic, Anel; Gillman, Aaron Nicholas; Manzi, Aime; Robson Moe, Natasha-Anne; Lauksund, Silje; Lorentzen, Øyvind; Aarag, Elizabeth; Kloos, Julia Maria; Hegstad, Kristin; Cavanagh, Pauline; Bleis, Christina; Storflor, Merete. How to blast a biofilm. Forskningsdagene 2018 2018-09-23 - 2018-09-23 2018.

  • Beukers, Alicia G.; Hasman, Henrik; Hegstad, Kristin; van Hal, Sebastiaan J.. Recommendations to address the difficulties encountered when determining linezolid resistance from whole-genome sequencing data. Antimicrobial Agents and Chemotherapy 2018; Volum 62:e00613-18 (8). ISSN 0066-4804.s 1 - 3.s doi: 10.1128/AAC.00613-18.

  • Wagner, Theresa; Joshi, Bishnu; Janice, Jessin; Paganelli, Fernanda; Willems, Rob; Askarian, Fatemeh; Skalko-Basnet, Natasa; Hagestad, Ole-Christian; Mekhlif, Ahmed; Wai, Sun Nyunt; Johannessen, Mona; Hegstad, Kristin. Virulence factors and antibiotic resistance related proteins are associated with membrane vesicles produced by clinically relevant Enterococcus faecium strains (talk). ICE, International Conference on Enterococci 2018-04-15 - 2018-04-19 2018.

  • Wagner, Theresa; Paganelli, Fernanda; Willems, Rob; Johannessen, Mona; Hegstad, Kristin. A TIR domain protein of Enterococcus faecium interferes with TLR-2 signaling and enhances growth in blood (poster). EMBO Conference on Hijacking host signalling and epigenetic mimicry during infections 2017-06-13 - 2017-06-16 2017.

  • Sivertsen, Audun; James Peter, Jessin Janice; Sjögren, Ingegerd; Hegstad, Kristin. Vancomycin variable resistance may occur through creation of a novel promoter after deletions by polymerase slippage. 27th European Congress of Clinical Microbiology and Infectious Diseases 2017-04-21 - 2017-04-25 2017.

  • James Peter, Jessin Janice; Olsen, Karina; Hegstad, Kristin. Occurrence of vanB vancomycin resistant enterococci (VRE) in a patient. 27th European Congress of Clinical Microbiology and Infectious Diseases 2017-04-22 - 2017-04-25 2017.

  • Sivertsen, Audun; James Peter, Jessin Janice; Sjögren, Ingegerd; Hegstad, Kristin. Vancomycin variable resistance may occur through different mechanisms. 34th Annual meeting of Nordic Society of Clinical Microbiology and Infectious Diseases 2017-08-31 - 2017-09-03 2017.

  • Hegstad, Kristin. Vankomycin variable enterokokker. NORM dagen 2017-11-22 - 2017.

  • Wagner, Theresa; Joshi, Bishnu; James Peter, Jessin Janice; Askarian, Fatemeh; Skalko-Basnet, Natasa; Wai, SN; Hegstad, Kristin; Johannessen, Mona. Enterococcus faecium releases membrane vesicles containing virulence factors and resistance determinants (poster). Meeting of The National Graduate School in Infection Biology and Antimicrobials (IBA) 2017-11-13 - 2017-11-14 2017.. Meeting of The National Graduate School in Infection Biology and Antimicrobials (IBA 2017-11-13 - 2017-11-14 2017.

  • Wagner, Theresa; Paganelli, Fernanda; Janice, Jessin; Willems, Rob; Strijp, Jos; Johannessen, Mona; Hegstad, Kristin. Tir-domain proteins of nosocomial Enterococcus faecium interfere with TLR-2 signaling and enhance growth in blood (talk). 34th Annual Metting of NSCMID 2017-08-31 - 2017-09-03 2017.

  • Wagner, Theresa; Joshi, Bishnu; Janice, Jessin; Askarian, Fatemeh; Skalko-Basnet, Natasa; Wai, Sun Nyunt; Hegstad, Kristin; Johannessen, Mona. Enterococcus faecium releases membrane vesicles containing virulence factors and resistance determinants (poster). Meeting of The National Graduate School in Infection Biology and Antimicrobials (IBA) 2017-11-13 - 2017-11-14 2017.

  • Wagner, Theresa; Johannessen, Mona; Hegstad, Kristin. Tir-proteins as novel virulence factors in Enterococcus faecium (talk). Kick-Off meeting for IBA 2016-11-14 - 2016-11-15 2016.

  • Wagner, Theresa; Pedersen, Torunn Annie; Johannessen, Mona; Strijp, Jos; Willems, Rob; Paganelli, Fernanda; Hegstad, Kristin. Novel putative virulence factors expressed in invasive Enterococcus faecium (talk). UMCU's Medical Microbiology Koepel conference 2016-04-14 - 2016-04-15 2016.

  • Wagner, Theresa; Pedersen, Torunn Annie; Johannessen, Mona; Strijp, Jos; Willems, Rob; Paganelli, Fernanda; Hegstad, Kristin. Novel putative virulence factors expressed in invasive Enterococcus faecium (poster). Scientific Spring Meeting KVNM & NVMM 2016 2016-03-22 - 2016-03-23 2016.

  • Hegstad, Kristin; Samuelsen, Ørjan; Hegstad, Joachim; Sundsfjord, Arnfinn. Molecular methods for detection of antibacterial resistance genes: rationale and applications. Wolters Kluwer 2015 ISBN 978-1-4511-7675-9.s 408 - 449.

  • Wagner, Theresa; Hegstad, Kristin; Pedersen, Torunn Annie. Novel putative virulence factors are expressed in Enterococcus faecium and significantly more prevalent in invasive strains (poster). NSCMID 2015 - Infections and Antibiotics 2015-09-03 - 2016-09-06 2015.

  • Wagner, Theresa; Hegstad, Kristin; Pedersen, Torunn Annie. Novel putative virulence factors are expressed in Enterococcus faecium and significantly more prevalent in invasive strains (talk). NSCMID 2015 - Infections and Antibiotics 2015-09-03 - 2016-09-06 2015.

  • Thilesen, Carina Merethe; Bjørang, Ola; Skrede, Thomas; Aronsen, Tommy; AasnÆs, bettina; Sundsfjord, Arnfinn; Hegstad, Kristin. Emergence of mutation-based linezolid-resistant invasive Enterococcus faecalis in a haemodialysis patient in Norway. APMIS - Journal of Pathologiy, Microbiology and Immunology 2014; Volum 122 (1). ISSN 0903-4641.s 83 - 84.s doi: 10.1111/apm.12100.

  • Pedersen, Torunn Annie; Lunde, Tracy Tamara Munthali; thoresen, lars; Onken, Anette; Aasnæs, Bettina; Sundsfjord, Arnfinn; Hegstad, Kristin. The first case of plasmid mediated linezolid-resistance in human faecal isolate of Enterococcus faecium in Norway was associated with import and high-level glycopeptide and aminoglycoside resistance. 24th European Congress of Clinical Microbiology and Infectious Diseases 2014-05-10 - 2014-05-13 2014.

  • Thilesen, Carina Merethe; Bjørang, Ola; Skrede, Thomas; Aronsen, Tommy; AasnÆs, bettina; Sundsfjord, Arnfinn; Hegstad, Kristin. Emergence of mutation-based linezolid-resistant invasive Enterococcus faecalis in a haemodialysis patient in Norway. APMIS - Journal of Pathologiy, Microbiology and Immunology 2014; Volum 122 (1). ISSN 0903-4641.s 83 - 84.s doi: 10.1111/apm.12100.

  • Hegstad, Kristin. Vancomycin- og linezolidresistens hos enterokokker. Teoretisk og praktisk kurs i resistensbestemmelse av bakterier - “AFA-kurset”. 2013-11-06 - 2013-11-07 2013.

  • Haldorsen, Bjørg; Samuelsen, Ørjan; Sundsfjord, Arnfinn; Hegstad, Kristin. Agreement of the MIC Test Strip and Etest with microbroth dilution in glycopeptide susceptibility testing of Enterococcus sp. 23rd European Congress of Clinical Microbiology and Infectious Diseases 2013-04-27 - 2013-04-30 2013.

  • Sundsfjord, Arnfinn; Samuelsen, Ørjan; Hegstad, Kristin; Haldorsen, Bjørg C. I førstelinjen mot resistente bakterier. Bioingeniøren 2012 (2). ISSN 0801-6828.s 12 - 14.

  • Hegstad, Kristin. NordicAST VRE Study 2012. NordicAST Workshop 2012-05-30 - 2012-05-31 2012.

  • Hegstad, Kristin. Vankomycinresistens hos enterokokker – hvordan skal vi undersøke det?. NORM dagen 2012-11-22 - 2012-11-22 2012.

  • Pedersen, Torunn Annie; Langnes, Belinda; Rosvoll, Torill Cathrin Solvær; Aasnæs, Bettina; Hammerum, Anette M.; Lester, Camilla; Simonsen, Gunnar Skov; Hegstad, Kristin; Sundsfjord, Arnfinn. Increased prevalence of high-level gentamicin resistance in invasive E. faecium strains in Norway is associated with hospital adapted genetic lineages carrying virulence determinants and aac(6')-Ie-aph(2")-Ia containing transferable megaplasmids. 21st European Congress of Clinical Microbiology and Infectious Diseases 2011-05-07 - 2011-05-10 2011.

  • Sivertsen, Audun; Lundblad, Eirik Wasmuth; Wisell, Karin Tegmark; Liljequist, Barbro Olsson; Billström, Hanna; Ullberg, Måns; Heimer, D; Sjögren, I; Aasnæs, Bettina; Sundsfjord, Arnfinn; Hegstad, Kristin. The widespread VRE outbreak in Swedish hospitals 2007-2009 was associated with clonal E. faecium CC17 genogroup strains harbouring several virulence traits and transferable vanB pRUM-like repA plasmids. 21st European Congress of Clinical Microbiology and Infectious Diseases 2011-05-07 - 2011-05-10 2011.

  • Lunestad, Bjørn Tore; Møretrø, Trond; Hegstad, Kristin; Langsrud, Solveig; Scheie, Anne Aamdal; Kapperud, Georg; Lassen, Jørgen Fr; Nygård, Karin Maria; Robertson, Lucy; Nesbakken, Truls; Olsvik, Ørjan; Tranulis, Michael A.; Tryland, Morten; Rimstad, Espen. Chlorhexidine compounds in cosmetic products Risk assessment of antimicrobial and antibiotic resistance development in microorganisms. Opinion of the Panel on Biological Hazards of the Norwegian Scientific Committee for Food Safety. (Fulltekst: https://vkm.no/download/18.d44969415d027c43cfa482/1500467964665/10b449dcc5.pdf (Omtale: https://vkm.no/risikovurderinger/allevurderinger/risikovurderingavklorheksidinikosmetiskeprodukter.4.a665c1015c865cc85bdf8f1.html) 2010 (2010:15) ISBN 978-82-8082-404-2. ISSN 2535-4019.

  • Karah, Nabil; Haldorsen, Bjørg; Hegstad, Kristin; Sundsfjord, arnfinn; Samulesen, Ørjan. Molecular identification and characterisation of Acinetobacter baumannii in Norwegian strain collections reveal major discrepancies to phenotypic identification and the presence of carbapenemase producing clonal lineages. 19 th European Congress of Clinical Microbiology and Infectious Diseases 2009-05-16 - 2009-05-19 2009.

  • Lunestad, Bjørn Tore; Hegstad, Kristin; Langsrud, Solveig; Scheie, Anne Aamdal; Sunde, Marianne. Quaternary ammonium compounds in cosmetic products. Risk assessment of antimicrobial and antibiotic resistance development in microorganisms. Opinion of the Panel on Biological Hazards of the Norwegian Scientific Committee for Food Safety. (Fulltekst: https://vkm.no/download/18.2994e95b15cc545071631fb0/1501261241042/c71fe47b61.pdf (Omtale: https://vkm.no/risikovurderinger/allevurderinger/risikovurderingavqacikosmetiskeprodukt.4.2994e95b15cc545071631ec1.html) 2009 (2009:27) ISBN 978-82-8082-339-7. ISSN 2535-4019.

  • Bjørkeng, Eva katrin; Rasmussen, Gunlög; Sundsfjord, arnfinn; Sjöberg, Lennart; Söderquist, Bo; Hegstad, Kristin. Utbrudd av VanB-type vankomycinresistente Enterococcus faecium i et lavendemisk område - spredning av suksessfulle kloner og plasmider med stabilitetsfunksjoner. Den 45. Årskonferansen 2009-12-03 - 2009-12-04 2009.

  • Haldorsen, Bjørg; Aasnæs, Bettina; Hegstad, Kristin; Hanssen, Anne-Merethe; Simonsen, Gunnar Skov; Walsh, Timothy R; Sundsfjord, arnfinn; Lundbland, Eirik. AmpC b-lactamases in Norwegian clinical isolates of E. coli. 26th Annual Meeting of the Scandinavian Society for Antimicrobial Chemotherapy 2009-09-03 - 2009-09-06 2009.

  • Naseer, Umaer; Haldorsen, Bjørg C; Dahl, Kristin Hegstad; Scheutz, Flemming; Simonsen, Gunnar Skov; Walsh, Timothy R.; Sundsfjord, arnfinn. CTX-M Producing Multi-drug Resistant Clinical Isolates of Escherichia coli in Norway are Associated with Virulent Genetic Lineages. 107th General Meeting 2007-05-21 - 2007-05-25 2007.

  • Naseer, Umaer; Haldorsen, Bjørg C; Tofteland, Ståle; Dahl, Kristin Hegstad; Simonsen, Gunnar Skov; Walsh, Timothy R.; Sundsfjord, arnfinn. Virulent clones of E.coli are associated with CTX-M type ESBL-production and multi-resistance in Norway. Årskonferansen 2006, Nasjonalt Folkehelseinstitutt 2006-12-07 - 2006-12-08 2006.

  • Bjørkeng, Eva katrin; Tadesse, Girum; Butaye, Patric; Willems, Rob; Sollid, johanna u ericson; Sundsfjord, arnfinn; Dahl, Kristin Hegstad. CcrA/B - a New Gene Capture System in E. faecium?. CAMST seminar 2006-04-21 - 2006-04-21 2006.

  • Bjørkeng, Eva katrin; Tadesse, Girum; Butaye, Patrick; Willems, Rob; Sollid, Johanna E.; Sundsfjord, arnfinn; Dahl, Kristin Hegstad. Dissemination of ccrA- and ccrB-like in CC-17 of Enterococcus faecium. National Conference on Microbial Sciences and Technology 2006-06-17 - 2006-06-19 2006.

  • Dahl, Kristin Hegstad; Bjørkeng, Eva katrin; Tadesse, Girum T; Butaye, Patrick; Willems, Rob J; Sollid, johanna u ericson; Sundsfjord, arnfinn. Dissemination of ccrA- and ccrB-like in enterococci. 2nd FEMS Congress of European Microbiologists 2006-07-04 - 2006-07-08 2006.

  • Haldorsen, Bjørg; Lundblad, Eirik W; AasnÆs, bettina; Dahl, Kristin Hegstad; Hanssen, Anne-Merethe; Simonsen, Gunnar Skov; Walsh, TR; Sundsfjord, arnfinn. Evaluation of an AmpC disk test and genetic detection of imported ampC-genes in Norwegian clinical strains of E. coli. 16th European Congress of Clinical Microbiology and Infectious Diseases 2006-04-01 - 2006-04-04 2006.

  • Sollid, johanna u ericson; Mohn, Stein Christian; Hanssen, Anne Merethe; Bjørkeng, Eva katrin; Cavanagh, J. Pauline; Tessem, trine juliane; Sundsfjord, Arnfinn; Dahl, kristin hegstad. Horizontal transfer of housekeeping genes by large chromosomal elements in Enterococcus faecium. 2nd international ASM-FEMS Conference on Enterococci 2005-08-28 - 2005-08-31 2005.

  • Sollid, johanna u ericson; Dahl, kristin hegstad; Mohn, Stein Christian; Sundsfjord, Arnfinn. Tnvamp – an integrative and conjugative element (ICE) in Enterococcus faecium. The Norwegian Biochemical Society 41st Contact Meeting 2005-01-13 - 2005-01-16 2005.

  • Tadesse, Girum T; Dahl, Kristin Hegstad; Sollid, johanna u ericson; Sundsfjord, Arnfinn. Putative ccrA and ccrB serine recombinase genes in Enterococcus faecium: Molecular epidemiology and bioinformatics study. 2nd International ASM-FEMS Conference on Enterococci 2005-08-28 - 2005-08-31 2005.

  • Wagner, Theresa; Ajayi, Clement; Johannessen, Mona; Hegstad, Kristin; Grimnes, Gro; Hemmingsen, Ingrid. Brukermøte 2020. Brukerutvalg HN prosjekter 2020-03-02 - 2020-03-02 2020.

  • Wagner, Theresa; Johannessen, Mona; Hegstad, Kristin. Towards a vaccine based on enterococcal membrane vesicles. Optimmunize: Improving the beneficial effects of vaccines 2020-02-19 - 2020-02-21 2020.

  • Basic, A; Matuschek, Erika; Karatuna, O; Haldorsen, Bjørg C; Hegstad, Kristin; Åhman, Jenny; Sundsfjord, Arnfinn; Kahlmeter, Gunnar. Evaluation of gradient tests for vancomycin MIC determination in Enterococcus faecalis and Enterococcus faecium. Effect of incubation for 16-20 hours vs. 24 hours. 29th European Congress of Clinical Microbiology and Infectious Diseases 2019-04-13 - 2019-04-16 2019.

  • Hatlegjerde Fossan, Randi H; Hopperstad, Daniel; Haldorsen, Bjørg C; Hegstad, Kristin. Kan oksegalletilsetning i MH- og BHI-agar fremme fenotypisk påvisning av vanB-VRE med lavgradig vankomycin-MIC?. Bioingeniørkongressen 2019 2019-05-22 - 2019-05-24 2019.

  • Lindemann, Paul Christoffer; Haukeland, TS; Kolstad, H; Haldorsen, Bjørg C; Hegstad, Kristin. Antimicrobial susceptibility testing of Enterococcus spp. in a VanB-VRE outbreak setting. 36th Annual meeting of Nordic Society of Clinical Microbiology and Infectious Diseases 2019-09-12 - 2019-09-15 2019.

  • James Peter, Jessin Janice; Hegstad, Joachim; Josefsen, Ellen H.; Sundsfjord, Arnfinn; Hegstad, Kristin. Increased prevalence of linezolid resistance mong clinical enterococci in Norway mainly due to spread of optrA E. faecalis. 12th International Meeting on Microbial Epidemiological Markers 2019-09-18 - 2019-09-21 2019.

  • Nygaard, Randi Monsen; Hegstad, Kristin; Kommedal, Øyvind; Lindemann, Paul Christoffer. High prevalence of vanB in non-enterococcal flora including a novel species contributes to persistent outbreaks of vancomycin resistant enterococci in a Norwegian hospital. 12th International Meeting on Microbial Epidemiological Markers 2019-09-18 - 2019-09-21 2019.

  • Joshi, Bishnu; Wai, Sun Nyunt; Johannessen, Mona; Hegstad, Kristin. Extracellular vesicle -associated small RNA released by Staphylococcus aureus (MSSA476) grown under stress condition. 3rd annual IBA meeting 2019-11-04 - 2019-11-05 2019.

  • Wagner, Theresa; Johannessen, Mona; Hegstad, Kristin. Investigating the immune response towards enterococcal membrane vesicles.. IBA annual meeting 2019-11-04 - 2019-11-05 2019.

  • Wagner, Theresa; Ajayi, Clement; Hegstad, Kristin; Johannessen, Mona; Grimnes, Gro; Hemmingsen, Ingrid. Brukermøte 2019. Brukerutvalg HN prosjekter 2019-02-15 - 2019.

  • Al-Rubaye, Mushtaq Talib Shawi; Janice, Jessin; Löhr, Iren Høyland; Sundsfjord, Arnfinn; Hegstad, Kristin. THE FIRST VANE VANCOMYCIN RESISTANT ENTEROCOCCUS FAECALIS IN NORWAY. 3rd annual Iba school meeting 2019-11-03 - 2019-11-05 2019.

  • Al-Rubaye, Mushtaq Talib Shawi; Janice, Jessin; Vildershøj Bjørnholt, Jørgen; Kacelink, Oliver; Haldorsen, Biørg C.; Nygaard, Randi M.; Sundsfjord, Arnfinn; Hegstad, Kristin. POPULATION STRUCTURE OF THE NORWEGIAN VANCOMYCIN RESISTANT AND SENSITIVE ENTEROCOCCI 2010-2015. 3rd annual Iba school meeting 2019-11-03 - 2019-11-05 2019.

  • Wagner, Theresa; Johannessen, Mona; Hegstad, Kristin. Investigating the immune response towards enterococcal membrane vesicles. CEMIR 2019: The second Conference on Molecular Mechanisms of Inflammation 2019-06-03 - 2019-06-06 2019.

  • Wagner, Theresa; Janice, Jessin; Sivertsen, Audun; Sjögren, Ingegerd; Sundsfjord, Arnfinn; Hegstad, Kristin. The bag of tricks of vancomycin variable enterococci: an alternative constitutive vanHAX-promoter, varying copy numbers and transferable resistance. 12th International Meeting on Microbial Epidemiological Markers (IMMEM XII) 2019-09-18 - 2019-09-21 2019.

  • Wagner, Theresa; Joshi, Bishnu; Janice, Jessin; Paganelli, Fernanda; Willems, Rob; Askarian, Fatemeh; Skalko-Basnet, Natasa; Hagestad, Ole-Christian; Mekhlif, Ahmed; Wai, Sun Nyunt; Johannessen, Mona; Hegstad, Kristin. Virulence factors and antibiotic resistance related proteins are associated with membrane vesicles produced by clinically relevant Enterococcus faecium strains (poster). ICE, International Conference on Enterococci 2018-04-15 - 2018-04-19 2018.

  • Hegstad, Kristin. Vankomycinresistens hos enterokokker. Section meeting Department of microbiology, Haukeland University Hospital 2018-12-04 - 2018.

  • Hegstad, Kristin. Vankomycinresistente enterokokker – hvorfor er de så suksessfulle i sykehuset?. Online teaching Infection Control Norway 2018-05-09 - 2018.

  • Hegstad, Kristin. Hvorfor kan VRE være vanskelig å detektere i laboratoriet?. Infektionsveckan och Mikrobiologiskt Vårmöte i Karlstad 2018-05-29 - 2018-05-31 2018.

  • Berhoff, Eva; Löhr, Iren Høyland; Lindemann, PC; Hetland, MAK; James Peter, Jessin Janice; Hegstad, Kristin. 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. 28th European Congress of Clinical Microbiology and Infectious Diseases 2018-04-21 - 2018-04-24 2018.

  • James Peter, Jessin Janice; Josefsen, Ellen H.; Sundsfjord, Arnfinn; Hegstad, Kristin. Increased prevalence of linezolid resistance among clinical enterococci in Norway.. 5th International Conference on Enterococci 2018-04-15 - 2018-04-19 2018.

  • Wagner, Theresa; Hegstad, Kristin; Johannessen, Mona; Pedersen, Torunn Annie. How to Be a Bad Bug: Virulence Determinants of Enterococcus faecium. 2018 (2018) ISBN 978-82-7589-613-9.

  • Wagner, Theresa; Sivertsen, Audun; Janice, Jessin; Sjögren, Ingegerd; Sundsfjord, Arnfinn; Hegstad, Kristin. Vancomycin variable resistance may occur through creation of a novel constitutive vanHAX-promoter by illegitimate recombination. NDPIA/IBA course on “Antibiotics and Antibiotic Resistance” 2018-11-26 - 2018-11-30 2018.

  • Abel, Sören; Mahmutovic, Anel; Gillman, Aaron Nicholas; Manzi, Aime; Robson Moe, Natasha-Anne; Lauksund, Silje; Lorentzen, Øyvind; Aarag, Elizabeth; Kloos, Julia Maria; Hegstad, Kristin; Cavanagh, Pauline; Bleis, Christina; Storflor, Merete. How to blast a biofilm. Forskningsdagene 2018 2018-09-23 - 2018-09-23 2018.

  • Beukers, Alicia G.; Hasman, Henrik; Hegstad, Kristin; van Hal, Sebastiaan J.. Recommendations to address the difficulties encountered when determining linezolid resistance from whole-genome sequencing data. Antimicrobial Agents and Chemotherapy 2018; Volum 62:e00613-18 (8). ISSN 0066-4804.s 1 - 3.s doi: 10.1128/AAC.00613-18.

  • Wagner, Theresa; Joshi, Bishnu; Janice, Jessin; Paganelli, Fernanda; Willems, Rob; Askarian, Fatemeh; Skalko-Basnet, Natasa; Hagestad, Ole-Christian; Mekhlif, Ahmed; Wai, Sun Nyunt; Johannessen, Mona; Hegstad, Kristin. Virulence factors and antibiotic resistance related proteins are associated with membrane vesicles produced by clinically relevant Enterococcus faecium strains (talk). ICE, International Conference on Enterococci 2018-04-15 - 2018-04-19 2018.

  • Wagner, Theresa; Paganelli, Fernanda; Willems, Rob; Johannessen, Mona; Hegstad, Kristin. A TIR domain protein of Enterococcus faecium interferes with TLR-2 signaling and enhances growth in blood (poster). EMBO Conference on Hijacking host signalling and epigenetic mimicry during infections 2017-06-13 - 2017-06-16 2017.

  • Sivertsen, Audun; James Peter, Jessin Janice; Sjögren, Ingegerd; Hegstad, Kristin. Vancomycin variable resistance may occur through creation of a novel promoter after deletions by polymerase slippage. 27th European Congress of Clinical Microbiology and Infectious Diseases 2017-04-21 - 2017-04-25 2017.

  • James Peter, Jessin Janice; Olsen, Karina; Hegstad, Kristin. Occurrence of vanB vancomycin resistant enterococci (VRE) in a patient. 27th European Congress of Clinical Microbiology and Infectious Diseases 2017-04-22 - 2017-04-25 2017.

  • Sivertsen, Audun; James Peter, Jessin Janice; Sjögren, Ingegerd; Hegstad, Kristin. Vancomycin variable resistance may occur through different mechanisms. 34th Annual meeting of Nordic Society of Clinical Microbiology and Infectious Diseases 2017-08-31 - 2017-09-03 2017.

  • Hegstad, Kristin. Vankomycin variable enterokokker. NORM dagen 2017-11-22 - 2017.

  • Wagner, Theresa; Joshi, Bishnu; James Peter, Jessin Janice; Askarian, Fatemeh; Skalko-Basnet, Natasa; Wai, SN; Hegstad, Kristin; Johannessen, Mona. Enterococcus faecium releases membrane vesicles containing virulence factors and resistance determinants (poster). Meeting of The National Graduate School in Infection Biology and Antimicrobials (IBA) 2017-11-13 - 2017-11-14 2017.. Meeting of The National Graduate School in Infection Biology and Antimicrobials (IBA 2017-11-13 - 2017-11-14 2017.

  • Wagner, Theresa; Paganelli, Fernanda; Janice, Jessin; Willems, Rob; Strijp, Jos; Johannessen, Mona; Hegstad, Kristin. Tir-domain proteins of nosocomial Enterococcus faecium interfere with TLR-2 signaling and enhance growth in blood (talk). 34th Annual Metting of NSCMID 2017-08-31 - 2017-09-03 2017.

  • Wagner, Theresa; Joshi, Bishnu; Janice, Jessin; Askarian, Fatemeh; Skalko-Basnet, Natasa; Wai, Sun Nyunt; Hegstad, Kristin; Johannessen, Mona. Enterococcus faecium releases membrane vesicles containing virulence factors and resistance determinants (poster). Meeting of The National Graduate School in Infection Biology and Antimicrobials (IBA) 2017-11-13 - 2017-11-14 2017.

  • Wagner, Theresa; Johannessen, Mona; Hegstad, Kristin. Tir-proteins as novel virulence factors in Enterococcus faecium (talk). Kick-Off meeting for IBA 2016-11-14 - 2016-11-15 2016.

  • Wagner, Theresa; Pedersen, Torunn Annie; Johannessen, Mona; Strijp, Jos; Willems, Rob; Paganelli, Fernanda; Hegstad, Kristin. Novel putative virulence factors expressed in invasive Enterococcus faecium (talk). UMCU's Medical Microbiology Koepel conference 2016-04-14 - 2016-04-15 2016.

  • Wagner, Theresa; Pedersen, Torunn Annie; Johannessen, Mona; Strijp, Jos; Willems, Rob; Paganelli, Fernanda; Hegstad, Kristin. Novel putative virulence factors expressed in invasive Enterococcus faecium (poster). Scientific Spring Meeting KVNM & NVMM 2016 2016-03-22 - 2016-03-23 2016.

  • Hegstad, Kristin; Samuelsen, Ørjan; Hegstad, Joachim; Sundsfjord, Arnfinn. Molecular methods for detection of antibacterial resistance genes: rationale and applications. Wolters Kluwer 2015 ISBN 978-1-4511-7675-9.s 408 - 449.

  • Wagner, Theresa; Hegstad, Kristin; Pedersen, Torunn Annie. Novel putative virulence factors are expressed in Enterococcus faecium and significantly more prevalent in invasive strains (poster). NSCMID 2015 - Infections and Antibiotics 2015-09-03 - 2016-09-06 2015.

  • Wagner, Theresa; Hegstad, Kristin; Pedersen, Torunn Annie. Novel putative virulence factors are expressed in Enterococcus faecium and significantly more prevalent in invasive strains (talk). NSCMID 2015 - Infections and Antibiotics 2015-09-03 - 2016-09-06 2015.

  • Thilesen, Carina Merethe; Bjørang, Ola; Skrede, Thomas; Aronsen, Tommy; AasnÆs, bettina; Sundsfjord, Arnfinn; Hegstad, Kristin. Emergence of mutation-based linezolid-resistant invasive Enterococcus faecalis in a haemodialysis patient in Norway. APMIS - Journal of Pathologiy, Microbiology and Immunology 2014; Volum 122 (1). ISSN 0903-4641.s 83 - 84.s doi: 10.1111/apm.12100.

  • Pedersen, Torunn Annie; Lunde, Tracy Tamara Munthali; thoresen, lars; Onken, Anette; Aasnæs, Bettina; Sundsfjord, Arnfinn; Hegstad, Kristin. The first case of plasmid mediated linezolid-resistance in human faecal isolate of Enterococcus faecium in Norway was associated with import and high-level glycopeptide and aminoglycoside resistance. 24th European Congress of Clinical Microbiology and Infectious Diseases 2014-05-10 - 2014-05-13 2014.

  • Thilesen, Carina Merethe; Bjørang, Ola; Skrede, Thomas; Aronsen, Tommy; AasnÆs, bettina; Sundsfjord, Arnfinn; Hegstad, Kristin. Emergence of mutation-based linezolid-resistant invasive Enterococcus faecalis in a haemodialysis patient in Norway. APMIS - Journal of Pathologiy, Microbiology and Immunology 2014; Volum 122 (1). ISSN 0903-4641.s 83 - 84.s doi: 10.1111/apm.12100.

  • Hegstad, Kristin. Vancomycin- og linezolidresistens hos enterokokker. Teoretisk og praktisk kurs i resistensbestemmelse av bakterier - “AFA-kurset”. 2013-11-06 - 2013-11-07 2013.

  • Haldorsen, Bjørg; Samuelsen, Ørjan; Sundsfjord, Arnfinn; Hegstad, Kristin. Agreement of the MIC Test Strip and Etest with microbroth dilution in glycopeptide susceptibility testing of Enterococcus sp. 23rd European Congress of Clinical Microbiology and Infectious Diseases 2013-04-27 - 2013-04-30 2013.

  • Sundsfjord, Arnfinn; Samuelsen, Ørjan; Hegstad, Kristin; Haldorsen, Bjørg C. I førstelinjen mot resistente bakterier. Bioingeniøren 2012 (2). ISSN 0801-6828.s 12 - 14.

  • Hegstad, Kristin. NordicAST VRE Study 2012. NordicAST Workshop 2012-05-30 - 2012-05-31 2012.

  • Hegstad, Kristin. Vankomycinresistens hos enterokokker – hvordan skal vi undersøke det?. NORM dagen 2012-11-22 - 2012-11-22 2012.

  • Pedersen, Torunn Annie; Langnes, Belinda; Rosvoll, Torill Cathrin Solvær; Aasnæs, Bettina; Hammerum, Anette M.; Lester, Camilla; Simonsen, Gunnar Skov; Hegstad, Kristin; Sundsfjord, Arnfinn. Increased prevalence of high-level gentamicin resistance in invasive E. faecium strains in Norway is associated with hospital adapted genetic lineages carrying virulence determinants and aac(6')-Ie-aph(2")-Ia containing transferable megaplasmids. 21st European Congress of Clinical Microbiology and Infectious Diseases 2011-05-07 - 2011-05-10 2011.

  • Sivertsen, Audun; Lundblad, Eirik Wasmuth; Wisell, Karin Tegmark; Liljequist, Barbro Olsson; Billström, Hanna; Ullberg, Måns; Heimer, D; Sjögren, I; Aasnæs, Bettina; Sundsfjord, Arnfinn; Hegstad, Kristin. The widespread VRE outbreak in Swedish hospitals 2007-2009 was associated with clonal E. faecium CC17 genogroup strains harbouring several virulence traits and transferable vanB pRUM-like repA plasmids. 21st European Congress of Clinical Microbiology and Infectious Diseases 2011-05-07 - 2011-05-10 2011.

  • Lunestad, Bjørn Tore; Møretrø, Trond; Hegstad, Kristin; Langsrud, Solveig; Scheie, Anne Aamdal; Kapperud, Georg; Lassen, Jørgen Fr; Nygård, Karin Maria; Robertson, Lucy; Nesbakken, Truls; Olsvik, Ørjan; Tranulis, Michael A.; Tryland, Morten; Rimstad, Espen. Chlorhexidine compounds in cosmetic products Risk assessment of antimicrobial and antibiotic resistance development in microorganisms. Opinion of the Panel on Biological Hazards of the Norwegian Scientific Committee for Food Safety. (Fulltekst: https://vkm.no/download/18.d44969415d027c43cfa482/1500467964665/10b449dcc5.pdf (Omtale: https://vkm.no/risikovurderinger/allevurderinger/risikovurderingavklorheksidinikosmetiskeprodukter.4.a665c1015c865cc85bdf8f1.html) 2010 (2010:15) ISBN 978-82-8082-404-2. ISSN 2535-4019.

  • Karah, Nabil; Haldorsen, Bjørg; Hegstad, Kristin; Sundsfjord, arnfinn; Samulesen, Ørjan. Molecular identification and characterisation of Acinetobacter baumannii in Norwegian strain collections reveal major discrepancies to phenotypic identification and the presence of carbapenemase producing clonal lineages. 19 th European Congress of Clinical Microbiology and Infectious Diseases 2009-05-16 - 2009-05-19 2009.

  • Lunestad, Bjørn Tore; Hegstad, Kristin; Langsrud, Solveig; Scheie, Anne Aamdal; Sunde, Marianne. Quaternary ammonium compounds in cosmetic products. Risk assessment of antimicrobial and antibiotic resistance development in microorganisms. Opinion of the Panel on Biological Hazards of the Norwegian Scientific Committee for Food Safety. (Fulltekst: https://vkm.no/download/18.2994e95b15cc545071631fb0/1501261241042/c71fe47b61.pdf (Omtale: https://vkm.no/risikovurderinger/allevurderinger/risikovurderingavqacikosmetiskeprodukt.4.2994e95b15cc545071631ec1.html) 2009 (2009:27) ISBN 978-82-8082-339-7. ISSN 2535-4019.

  • Bjørkeng, Eva katrin; Rasmussen, Gunlög; Sundsfjord, arnfinn; Sjöberg, Lennart; Söderquist, Bo; Hegstad, Kristin. Utbrudd av VanB-type vankomycinresistente Enterococcus faecium i et lavendemisk område - spredning av suksessfulle kloner og plasmider med stabilitetsfunksjoner. Den 45. Årskonferansen 2009-12-03 - 2009-12-04 2009.

  • Haldorsen, Bjørg; Aasnæs, Bettina; Hegstad, Kristin; Hanssen, Anne-Merethe; Simonsen, Gunnar Skov; Walsh, Timothy R; Sundsfjord, arnfinn; Lundbland, Eirik. AmpC b-lactamases in Norwegian clinical isolates of E. coli. 26th Annual Meeting of the Scandinavian Society for Antimicrobial Chemotherapy 2009-09-03 - 2009-09-06 2009.

  • Naseer, Umaer; Haldorsen, Bjørg C; Dahl, Kristin Hegstad; Scheutz, Flemming; Simonsen, Gunnar Skov; Walsh, Timothy R.; Sundsfjord, arnfinn. CTX-M Producing Multi-drug Resistant Clinical Isolates of Escherichia coli in Norway are Associated with Virulent Genetic Lineages. 107th General Meeting 2007-05-21 - 2007-05-25 2007.

  • Naseer, Umaer; Haldorsen, Bjørg C; Tofteland, Ståle; Dahl, Kristin Hegstad; Simonsen, Gunnar Skov; Walsh, Timothy R.; Sundsfjord, arnfinn. Virulent clones of E.coli are associated with CTX-M type ESBL-production and multi-resistance in Norway. Årskonferansen 2006, Nasjonalt Folkehelseinstitutt 2006-12-07 - 2006-12-08 2006.

  • Bjørkeng, Eva katrin; Tadesse, Girum; Butaye, Patric; Willems, Rob; Sollid, johanna u ericson; Sundsfjord, arnfinn; Dahl, Kristin Hegstad. CcrA/B - a New Gene Capture System in E. faecium?. CAMST seminar 2006-04-21 - 2006-04-21 2006.

  • Bjørkeng, Eva katrin; Tadesse, Girum; Butaye, Patrick; Willems, Rob; Sollid, Johanna E.; Sundsfjord, arnfinn; Dahl, Kristin Hegstad. Dissemination of ccrA- and ccrB-like in CC-17 of Enterococcus faecium. National Conference on Microbial Sciences and Technology 2006-06-17 - 2006-06-19 2006.

  • Dahl, Kristin Hegstad; Bjørkeng, Eva katrin; Tadesse, Girum T; Butaye, Patrick; Willems, Rob J; Sollid, johanna u ericson; Sundsfjord, arnfinn. Dissemination of ccrA- and ccrB-like in enterococci. 2nd FEMS Congress of European Microbiologists 2006-07-04 - 2006-07-08 2006.

  • Haldorsen, Bjørg; Lundblad, Eirik W; AasnÆs, bettina; Dahl, Kristin Hegstad; Hanssen, Anne-Merethe; Simonsen, Gunnar Skov; Walsh, TR; Sundsfjord, arnfinn. Evaluation of an AmpC disk test and genetic detection of imported ampC-genes in Norwegian clinical strains of E. coli. 16th European Congress of Clinical Microbiology and Infectious Diseases 2006-04-01 - 2006-04-04 2006.

  • Sollid, johanna u ericson; Mohn, Stein Christian; Hanssen, Anne Merethe; Bjørkeng, Eva katrin; Cavanagh, J. Pauline; Tessem, trine juliane; Sundsfjord, Arnfinn; Dahl, kristin hegstad. Horizontal transfer of housekeeping genes by large chromosomal elements in Enterococcus faecium. 2nd international ASM-FEMS Conference on Enterococci 2005-08-28 - 2005-08-31 2005.

  • Sollid, johanna u ericson; Dahl, kristin hegstad; Mohn, Stein Christian; Sundsfjord, Arnfinn. Tnvamp – an integrative and conjugative element (ICE) in Enterococcus faecium. The Norwegian Biochemical Society 41st Contact Meeting 2005-01-13 - 2005-01-16 2005.

  • Tadesse, Girum T; Dahl, Kristin Hegstad; Sollid, johanna u ericson; Sundsfjord, Arnfinn. Putative ccrA and ccrB serine recombinase genes in Enterococcus faecium: Molecular epidemiology and bioinformatics study. 2nd International ASM-FEMS Conference on Enterococci 2005-08-28 - 2005-08-31 2005.

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