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Genomic characterization of multidrug-resistant ESBL-producing Klebsiella pneumoniae isolated from a Ghanaian teaching hospital.

Agyepong N, Govinden U, Owusu-Ofori A, Amoako DG, Allam M, Janice J, Pedersen T, Sundsfjord A, Essack S.

Int J Infect Dis. 2019 May 23. pii: S1201-9712(19)30232-2. doi: 10.1016/j.ijid.2019.05.025. [Epub ahead of print]


Performance of the EUCAST disc diffusion method and two MIC methods in detection of Enterobacteriaceae with reduced susceptibility to meropenem: the NordicAST CPE study.

Haldorsen B, Giske CG, Hansen DS, Orri Helgason K, Kahlmeter G, Löhr IH, Matuschek E, Österblad M, Rantakokko-Jalava K, Wang M, Småbrekke L, Samuelsen Ø, Sundsfjord A.

J Antimicrob Chemother. 2018 Oct 1;73(10):2905. doi: 10.1093/jac/dky339. No abstract available.


Performance of the EUCAST disc diffusion method and two MIC methods in detection of Enterobacteriaceae with reduced susceptibility to meropenem: the NordicAST CPE study.

Haldorsen B, Giske CG, Hansen DS, Helgason KO, Kahlmeter G, Löhr IH, Matuschek E, Österblad M, Rantakokko-Jalava K, Wang M, Småbrekke L, Samuelsen Ø, Sundsfjord A; NordicAST CPE Study Group .

J Antimicrob Chemother. 2018 Oct 1;73(10):2738-2747. doi: 10.1093/jac/dky276. Erratum in: J Antimicrob Chemother. 2018 Oct 1;73(10):2905.


Faecal colonization of E. coli and Klebsiella spp. producing extended-spectrum beta-lactamases and plasmid-mediated AmpC in Mozambican university students.

Chirindze LM, Zimba TF, Sekyere JO, Govinden U, Chenia HY, Sundsfjord A, Essack SY, Simonsen GS.

BMC Infect Dis. 2018 May 30;18(1):244. doi: 10.1186/s12879-018-3154-1.


Pharmacokinetics and Pharmacodynamics of Fosfomycin and Its Activity against Extended-Spectrum-β-Lactamase-, Plasmid-Mediated AmpC-, and Carbapenemase-Producing Escherichia coli in a Murine Urinary Tract Infection Model.

Zykov IN, Samuelsen Ø, Jakobsen L, Småbrekke L, Andersson DI, Sundsfjord A, Frimodt-Møller N.

Antimicrob Agents Chemother. 2018 May 25;62(6). pii: e02560-17. doi: 10.1128/AAC.02560-17. Print 2018 Jun.


Spread of Plasmid-Encoded NDM-1 and GES-5 Carbapenemases among Extensively Drug-Resistant and Pandrug-Resistant Clinical Enterobacteriaceae in Durban, South Africa.

Pedersen T, Sekyere JO, Govinden U, Moodley K, Sivertsen A, Samuelsen Ø, Essack SY, Sundsfjord A.

Antimicrob Agents Chemother. 2018 Apr 26;62(5). pii: e02178-17. doi: 10.1128/AAC.02178-17. Print 2018 May.


End non-essential use of antimicrobials in livestock.

Holmes A, Holmes M, Gottlieb T, Price LB, Sundsfjord A.

BMJ. 2018 Jan 29;360:k259. doi: 10.1136/bmj.k259. No abstract available.


Molecular and epidemiological characterization of carbapenemase-producing Enterobacteriaceae in Norway, 2007 to 2014.

Samuelsen Ø, Overballe-Petersen S, Bjørnholt JV, Brisse S, Doumith M, Woodford N, Hopkins KL, Aasnæs B, Haldorsen B, Sundsfjord A; Norwegian Study Group on CPE.

PLoS One. 2017 Nov 15;12(11):e0187832. doi: 10.1371/journal.pone.0187832. eCollection 2017.


A comparison of extended spectrum β-lactamase producing Escherichia coli from clinical, recreational water and wastewater samples associated in time and location.

Jørgensen SB, Søraas AV, Arnesen LS, Leegaard TM, Sundsfjord A, Jenum PA.

PLoS One. 2017 Oct 17;12(10):e0186576. doi: 10.1371/journal.pone.0186576. eCollection 2017.


First environmental sample containing plasmid-mediated colistin-resistant ESBL-producing Escherichia coli detected in Norway.

Jørgensen SB, Søraas A, Arnesen LS, Leegaard T, Sundsfjord A, Jenum PA.

APMIS. 2017 Sep;125(9):822-825. doi: 10.1111/apm.12720. Epub 2017 Jun 22.


Fecal carriage of extended spectrum β-lactamase producing Escherichia coli and Klebsiella pneumoniae after urinary tract infection - A three year prospective cohort study.

Jørgensen SB, Søraas A, Sundsfjord A, Liestøl K, Leegaard TM, Jenum PA.

PLoS One. 2017 Mar 7;12(3):e0173510. doi: 10.1371/journal.pone.0173510. eCollection 2017.


Identification of a novel IMI carbapenemase variant (IMI-9) in Enterobacter cloacae complex.

Di Luca MC, Skaare D, Aasnaes B, Sundsfjord A, Samuelsen Ø.

Int J Antimicrob Agents. 2016 Dec;48(6):764-765. doi: 10.1016/j.ijantimicag.2016.09.004. Epub 2016 Sep 29. No abstract available.


H. Onarheim og medarbeidere svarer.

Onarheim H, Brekke RL, Leiva RA, Oma DH, Kolstad H, Samuelsen Ø, Sundsfjord A, Mylvaganam H.

Tidsskr Nor Laegeforen. 2016 Sep 27;136(17):1424-5. doi: 10.4045/tidsskr.16.0755. eCollection 2016 Sep. Norwegian. No abstract available.


A patient with sepsis following a burn injury in Pakistan.

Onarheim H, Brekke RL, Leiva RA, Oma DH, Kolstad H, Samuelsen Ø, Sundsfjord A, Mylvaganam H.

Tidsskr Nor Laegeforen. 2016 Aug 23;136(14-15):1228-32. doi: 10.4045/tidsskr.15.1208. eCollection 2016 Aug. English, Norwegian. No abstract available.


Multilevel population genetic analysis of vanA and vanB Enterococcus faecium causing nosocomial outbreaks in 27 countries (1986-2012).

Freitas AR, Tedim AP, Francia MV, Jensen LB, Novais C, Peixe L, Sánchez-Valenzuela A, Sundsfjord A, Hegstad K, Werner G, Sadowy E, Hammerum AM, Garcia-Migura L, Willems RJ, Baquero F, Coque TM.

J Antimicrob Chemother. 2016 Dec;71(12):3351-3366. Epub 2016 Aug 15.


Understanding the mechanisms and drivers of antimicrobial resistance.

Holmes AH, Moore LS, Sundsfjord A, Steinbakk M, Regmi S, Karkey A, Guerin PJ, Piddock LJ.

Lancet. 2016 Jan 9;387(10014):176-87. doi: 10.1016/S0140-6736(15)00473-0. Epub 2015 Nov 18. Review.


Extended-spectrum β-lactamase-producing Enterobacteriaceae among pregnant women in Norway: prevalence and maternal-neonatal transmission.

Rettedal S, Löhr IH, Bernhoff E, Natås OB, Sundsfjord A, Øymar K.

J Perinatol. 2015 Nov;35(11):907-12. doi: 10.1038/jp.2015.82. Epub 2015 Jul 9.


The antimicrobial activity of mecillinam, nitrofurantoin, temocillin and fosfomycin and comparative analysis of resistance patterns in a nationwide collection of ESBL-producing Escherichia coli in Norway 2010-2011.

Zykov IN, Sundsfjord A, Småbrekke L, Samuelsen Ø.

Infect Dis (Lond). 2016 Feb;48(2):99-107. doi: 10.3109/23744235.2015.1087648. Epub 2015 Sep 28.


Erratum to: Investigating the mobilome in clinically important lineages of Enterococcus faecium and Enterococcus faecalis.

Mikalsen T, Pedersen T, Willems R, Coque TM, Werner G, Sadowy E, van Schaik W, Jensen LB, Francia MV, Sundsfjord A, Hegstad K.

BMC Genomics. 2015 Sep 15;16(1):689. doi: 10.1186/s12864-015-1722-y. No abstract available.


Investigating the mobilome in clinically important lineages of Enterococcus faecium and Enterococcus faecalis.

Mikalsen T, Pedersen T, Willems R, Coque TM, Werner G, Sadowy E, van Schaik W, Jensen LB, Sundsfjord A, Hegstad K.

BMC Genomics. 2015 Apr 10;16:282. doi: 10.1186/s12864-015-1407-6. Erratum in: BMC Genomics. 2015;16(1):689.


Persistence of a pKPN3-like CTX-M-15-encoding IncFIIK plasmid in a Klebsiella pneumonia ST17 host during two years of intestinal colonization.

Löhr IH, Hülter N, Bernhoff E, Johnsen PJ, Sundsfjord A, Naseer U.

PLoS One. 2015 Mar 4;10(3):e0116516. doi: 10.1371/journal.pone.0116516. eCollection 2015.


Emergence of clonally related multidrug resistant Haemophilus influenzae with penicillin-binding protein 3-mediated resistance to extended-spectrum cephalosporins, Norway, 2006 to 2013.

Skaare D, Anthonisen IL, Kahlmeter G, Matuschek E, Natås OB, Steinbakk M, Sundsfjord A, Kristiansen BE.

Euro Surveill. 2014 Dec 11;19(49). pii: 20986.


Identification of VIM-2-producing Pseudomonas aeruginosa from Tanzania is associated with sequence types 244 and 640 and the location of blaVIM-2 in a TniC integron.

Moyo S, Haldorsen B, Aboud S, Blomberg B, Maselle SY, Sundsfjord A, Langeland N, Samuelsen Ø.

Antimicrob Agents Chemother. 2015 Jan;59(1):682-5. doi: 10.1128/AAC.01436-13. Epub 2014 Oct 20.


Within-population distribution of trimethoprim resistance in Escherichia coli before and after a community-wide intervention on trimethoprim use.

Sundqvist M, Granholm S, Naseer U, Rydén P, Brolund A, Sundsfjord A, Kahlmeter G, Johansson A.

Antimicrob Agents Chemother. 2014 Dec;58(12):7492-500. doi: 10.1128/AAC.03228-14. Epub 2014 Oct 6.


Extended-spectrum beta-lactamase-producing bacteria are not detected in supragingival plaque samples from human fecal carriers of ESBL-producing Enterobacteriaceae.

Søraas A, Olsen I, Sundsfjord A, Handal T, Bjørang O, Jenum PA.

J Oral Microbiol. 2014 Aug 20;6. doi: 10.3402/jom.v6.24026. eCollection 2014.


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.

Sivertsen A, Billström H, Melefors Ö, Liljequist BO, Wisell KT, Ullberg M, Özenci V, Sundsfjord A, Hegstad K.

PLoS One. 2014 Aug 25;9(8):e103274. doi: 10.1371/journal.pone.0103274. eCollection 2014.


Multilocus sequence typing and ftsI sequencing: a powerful tool for surveillance of penicillin-binding protein 3-mediated beta-lactam resistance in nontypeable Haemophilus influenzae.

Skaare D, Anthonisen IL, Caugant DA, Jenkins A, Steinbakk M, Strand L, Sundsfjord A, Tveten Y, Kristiansen BE.

BMC Microbiol. 2014 May 20;14:131. doi: 10.1186/1471-2180-14-131.


Evaluation of the total MBL confirm kit (ROSCO) for detection of metallo-β-lactamases in Pseudomonas aeruginosa and Acinetobacter baumannii.

Hansen F, Hammerum AM, Skov R, Haldorsen B, Sundsfjord A, Samuelsen O.

Diagn Microbiol Infect Dis. 2014 Aug;79(4):486-8. doi: 10.1016/j.diagmicrobio.2013.12.001. Epub 2013 Dec 10.


High prevalence of faecal carriage of ESBL-producing Enterobacteriaceae in Norwegian patients with gastroenteritis.

Jørgensen SB, Samuelsen O, Sundsfjord A, Bhatti SA, Jørgensen I, Sivapathasundaram T, Leegaard TM.

Scand J Infect Dis. 2014 Jun;46(6):462-5. doi: 10.3109/00365548.2014.896031. Epub 2014 Apr 4.


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.

Hegstad K, Giske CG, Haldorsen B, Matuschek E, Schønning K, Leegaard TM, Kahlmeter G, Sundsfjord A; NordicAST VRE Detection Study Group.

J Clin Microbiol. 2014 May;52(5):1582-9. doi: 10.1128/JCM.03544-13. Epub 2014 Mar 5.


High rate of per oral mecillinam treatment failure in community-acquired urinary tract infections caused by ESBL-producing Escherichia coli.

Søraas A, Sundsfjord A, Jørgensen SB, Liestøl K, Jenum PA.

PLoS One. 2014 Jan 15;9(1):e85889. doi: 10.1371/journal.pone.0085889. eCollection 2014.


Increased prevalence of aminoglycoside resistance in clinical isolates of Escherichia coli and Klebsiella spp. in Norway is associated with the acquisition of AAC(3)-II and AAC(6')-Ib.

Haldorsen BC, Simonsen GS, Sundsfjord A, Samuelsen O; Norwegian Study Group on Aminoglycoside Resistance.

Diagn Microbiol Infect Dis. 2014 Jan;78(1):66-9. doi: 10.1016/j.diagmicrobio.2013.10.001. Epub 2013 Oct 14.


Risk factors for community-acquired urinary tract infections caused by ESBL-producing enterobacteriaceae--a case-control study in a low prevalence country.

Søraas A, Sundsfjord A, Sandven I, Brunborg C, Jenum PA.

PLoS One. 2013 Jul 23;8(7):e69581. doi: 10.1371/journal.pone.0069581. Print 2013.


Large IncHI2-plasmids encode extended-spectrum β-lactamases (ESBLs) in Enterobacter spp. bloodstream isolates, and support ESBL-transfer to Escherichia coli.

Nilsen E, Haldorsen BC, Sundsfjord A, Simonsen GS, Ingebretsen A, Naseer U, Samuelsen O; Norwegian Study Group on Invasive Enterobacter.

Clin Microbiol Infect. 2013 Nov;19(11):E516-8. doi: 10.1111/1469-0691.12274. Epub 2013 Jun 25.


Emergence of mutation-based linezolid-resistant invasive Enterococcus faecalis in a haemodialysis patient in Norway.

Thilesen CM, Bjørang O, Skrede T, Aronsen T, Aasnaes B, Sundsfjord A, Hegstad K.

APMIS. 2014 Jan;122(1):83-4. doi: 10.1111/apm.12100. Epub 2013 May 8. No abstract available.


Characterisation of the plasmidome within Enterococcus faecalis isolated from marginal periodontitis patients in Norway.

Song X, Sun J, Mikalsen T, Roberts AP, Sundsfjord A.

PLoS One. 2013 Apr 30;8(4):e62248. doi: 10.1371/journal.pone.0062248. Print 2013.


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

Tofteland S, Naseer U, Lislevand JH, Sundsfjord A, Samuelsen O.

PLoS One. 2013;8(3):e59015. doi: 10.1371/journal.pone.0059015. Epub 2013 Mar 11.


Identification of Enterobacteriaceae isolates with OXA-48 and coproduction of OXA-181 and NDM-1 in Norway.

Samuelsen Ø, Naseer U, Karah N, Lindemann PC, Kanestrøm A, Leegaard TM, Sundsfjord A.

J Antimicrob Chemother. 2013 Jul;68(7):1682-5. doi: 10.1093/jac/dkt058. Epub 2013 Mar 5. No abstract available.


Long-term faecal carriage in infants and intra-household transmission of CTX-M-15-producing Klebsiella pneumoniae following a nosocomial outbreak.

Löhr IH, Rettedal S, Natås OB, Naseer U, Oymar K, Sundsfjord A.

J Antimicrob Chemother. 2013 May;68(5):1043-8. doi: 10.1093/jac/dks502. Epub 2013 Jan 3.


Dissemination of a carbapenem-resistant Acinetobacter baumannii strain belonging to international clone II/sequence type 2 and harboring a novel AbaR4-like resistance island in Latvia.

Saule M, Samuelsen Ø, Dumpis U, Sundsfjord A, Karlsone A, Balode A, Miklasevics E, Karah N.

Antimicrob Agents Chemother. 2013 Feb;57(2):1069-72. doi: 10.1128/AAC.01783-12. Epub 2012 Dec 10.


A nationwide study of mechanisms conferring reduced susceptibility to extended-spectrum cephalosporins in clinical Escherichia coli and Klebsiella spp. isolates.

Tofteland S, Dahl KH, Aasnæs B, Sundsfjord A, Naseer U.

Scand J Infect Dis. 2012 Dec;44(12):927-33. doi: 10.3109/00365548.2012.707330. Epub 2012 Sep 19.


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.

Rettedal S, Høyland Löhr I, Natås O, Sundsfjord A, Øymar K.

Scand J Infect Dis. 2013 Jan;45(1):54-8. doi: 10.3109/00365548.2012.713116. Epub 2012 Sep 19.


[Last chance for effective antibiotics?].

Dahle UR, Wester AL, Samuelsen Ø, Sundsfjord A.

Tidsskr Nor Laegeforen. 2012 Aug 21;132(15):1725-6. doi: 10.4045/tidsskr.12.0565. Norwegian. No abstract available.


Evaluation of ROSCO Neo-Sensitabs for phenotypic detection and subgrouping of ESBL-, AmpC- and carbapenemase-producing Enterobacteriaceae.

Hansen F, Hammerum AM, Skov RL, Giske CG, Sundsfjord A, Samuelsen O.

APMIS. 2012 Sep;120(9):724-32. doi: 10.1111/j.1600-0463.2012.02898.x. Epub 2012 Mar 20.


Multi-locus variable number of tandem repeat analysis for rapid and accurate typing of virulent multidrug resistant Escherichia coli clones.

Naseer U, Olsson-Liljequist BE, Woodford N, Dhanji H, Cantón R, Sundsfjord A, Lindstedt BA.

PLoS One. 2012;7(7):e41232. doi: 10.1371/journal.pone.0041232. Epub 2012 Jul 27.


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

Karah N, Sundsfjord A, Towner K, Samuelsen Ø.

Drug Resist Updat. 2012 Aug;15(4):237-47. doi: 10.1016/j.drup.2012.06.001. Epub 2012 Jul 27. Review.


First outbreak of extended-spectrum β-lactamase-producing Klebsiella pneumoniae in a Norwegian neonatal intensive care unit; associated with contaminated breast milk and resolved by strict cohorting.

Rettedal S, Löhr IH, Natås O, Giske CG, Sundsfjord A, Øymar K.

APMIS. 2012 Aug;120(8):612-21. doi: 10.1111/j.1600-0463.2012.02879.x. Epub 2012 Mar 24.


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.

Rosvoll TC, Lindstad BL, Lunde TM, Hegstad K, Aasnaes B, Hammerum AM, Lester CH, Simonsen GS, Sundsfjord A, Pedersen T.

FEMS Immunol Med Microbiol. 2012 Nov;66(2):166-76. doi: 10.1111/j.1574-695X.2012.00997.x. Epub 2012 Jun 27.


Prevalence and population structure of Staphylococcus aureus nasal carriage in healthcare workers in a general population. The Tromsø Staph and Skin Study.

Olsen K, Sangvik M, Simonsen GS, Sollid JU, Sundsfjord A, Thune I, Furberg AS.

Epidemiol Infect. 2013 Jan;141(1):143-52. doi: 10.1017/S0950268812000465. Epub 2012 Mar 22.

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