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Investigation of possible clonal transmission of carbapenemase-producing Klebsiella pneumoniae complex member isolates in Denmark using core genome MLST and National Patient Registry Data.

Hammerum AM, Lauridsen CAS, Blem SL, Roer L, Hansen F, Henius AE, Holzknecht BJ, Søes L, Andersen LP, Røder BL, Justesen US, Østergaard C, Søndergaard T, Dzajic E, Wang M, Fulgsang-Damgaard D, Møller KL, Porsbo LJ, Hasman H.

Int J Antimicrob Agents. 2020 Mar 2:105931. doi: 10.1016/j.ijantimicag.2020.105931. [Epub ahead of print]


Taxonomic reassessment of the genus Pseudocitrobacter using whole genome sequencing: Pseudocitrobacter anthropi is a later heterotypic synonym of Pseudocitrobacter faecalis and description of Pseudocitrobacter vendiensis sp. nov.

Kämpfer P, Fuglsang-Damgaard D, Overballe-Petersen S, Hasman H, Hammerum AM, Fuursted K, Blom J, Glaeser SP, Hansen F.

Int J Syst Evol Microbiol. 2020 Feb;70(2):1315-1320. doi: 10.1099/ijsem.0.003918.


2CS-CHXT Operon Signature of Chlorhexidine Tolerance among Enterococcus faecium Isolates.

Duarte B, Pereira AP, Freitas AR, Coque TM, Hammerum AM, Hasman H, Antunes P, Peixe L, Novais C.

Appl Environ Microbiol. 2019 Nov 14;85(23). pii: e01589-19. doi: 10.1128/AEM.01589-19. Print 2019 Dec 1.


Surveillance of vancomycin-resistant enterococci reveals shift in dominating clones and national spread of a vancomycin-variable vanA Enterococcus faecium ST1421-CT1134 clone, Denmark, 2015 to March 2019.

Hammerum AM, Justesen US, Pinholt M, Roer L, Kaya H, Worning P, Nygaard S, Kemp M, Clausen ME, Nielsen KL, Samulioniené J, Kjærsgaard M, Østergaard C, Coia J, Søndergaard TS, Gaini S, Schønning K, Westh H, Hasman H, Holzknecht BJ.

Euro Surveill. 2019 Aug;24(34). doi: 10.2807/1560-7917.ES.2019.24.34.1900503.


IncI1 ST3 and IncI1 ST7 plasmids from CTX-M-1-producing Escherichia coli obtained from patients with bloodstream infections are closely related to plasmids from E. coli of animal origin.

Valcek A, Roer L, Overballe-Petersen S, Hansen F, Bortolaia V, Leekitcharoenphon P, Korsgaard HB, Seyfarth AM, Hendriksen RS, Hasman H, Hammerum AM.

J Antimicrob Chemother. 2019 Aug 1;74(8):2171-2175. doi: 10.1093/jac/dkz199.


LRE-Finder, a Web tool for detection of the 23S rRNA mutations and the optrA, cfr, cfr(B) and poxtA genes encoding linezolid resistance in enterococci from whole-genome sequences.

Hasman H, Clausen PTLC, Kaya H, Hansen F, Knudsen JD, Wang M, Holzknecht BJ, Samulioniené J, Røder BL, Frimodt-Møller N, Lund O, Hammerum AM.

J Antimicrob Chemother. 2019 Jun 1;74(6):1473-1476. doi: 10.1093/jac/dkz092.


Infection with multiple carbapenemase-producing bacteria following cosmetic surgery in Iran detected after the introduction of systematic screening of repatriates.

Andrews V, Hansen F, Hammerum AM, Hasman H, Roer L, Hansen DS, Olesen B, Krogstrup NV, Dohrn N, Holzknecht BJ.

J Glob Antimicrob Resist. 2019 Mar;16:144-146. doi: 10.1016/j.jgar.2018.12.005. Epub 2019 Jan 10. No abstract available.


Evaluation of temocillin for phenotypic carbapenemase screening of Escherichia coli and Salmonella enterica isolates in relation to the presence of genes encoding ESBLs and carbapenemase production.

Cavaco LM, Hansen F, Mushtaq S, Hill RLR, Woodford N, Le Hello S, Hendriksen RS, Hammerum AM, Hasman H.

J Antimicrob Chemother. 2019 Mar 1;74(3):639-644. doi: 10.1093/jac/dky493.


Complete Genome Sequence of a Vancomycin-Resistant Sequence Type 203 Enterococcus faecium Strain with vanA Belonging to Complex Type 859.

Hoffmann M, Yao K, Allard M, Sanchez M, Andersen LP, Hasman H, Hammerum AM.

Microbiol Resour Announc. 2018 Jul 19;7(2). pii: e00815-18. doi: 10.1128/MRA.00815-18. eCollection 2018 Jul.


ST131 fimH22 Escherichia coli isolate with a blaCMY-2/IncI1/ST12 plasmid obtained from a patient with bloodstream infection: highly similar to E. coli isolates of broiler origin.

Roer L, Overballe-Petersen S, Hansen F, Johannesen TB, Stegger M, Bortolaia V, Leekitcharoenphon P, Korsgaard HB, Seyfarth AM, Mossong J, Wattiau P, Boland C, Hansen DS, Hasman H, Hammerum AM, Hendriksen RS.

J Antimicrob Chemother. 2019 Mar 1;74(3):557-560. doi: 10.1093/jac/dky484.


Update on prevalence and mechanisms of resistance to linezolid, tigecycline and daptomycin in enterococci in Europe: Towards a common nomenclature.

Bender JK, Cattoir V, Hegstad K, Sadowy E, Coque TM, Westh H, Hammerum AM, Schaffer K, Burns K, Murchan S, Novais C, Freitas AR, Peixe L, Del Grosso M, Pantosti A, Werner G.

Drug Resist Updat. 2018 Sep;40:25-39. doi: 10.1016/j.drup.2018.10.002. Epub 2018 Nov 2. Review.


Characterization of Diarrheagenic Enteroaggregative Escherichia coli in Danish Adults-Antibiotic Treatment Does Not Reduce Duration of Diarrhea.

Hebbelstrup Jensen B, Adler Sørensen C, Hebbelstrup Rye Rasmussen S, Rejkjær Holm D, Friis-Møller A, Engberg J, Mirsepasi-Lauridsen HC, Struve C, Hammerum AM, Porsbo LJ, Petersen RF, Petersen AM, Krogfelt KA.

Front Cell Infect Microbiol. 2018 Sep 27;8:306. doi: 10.3389/fcimb.2018.00306. eCollection 2018.


PME and Other ESBL-Positive Multiresistant Pseudomonas aeruginosa Isolated from Hospitalized Patients in the Region of Kurdistan, Iraq.

van Burgh S, Maghdid DM, Ganjo AR, Mansoor IY, Kok DJ, Fatah MH, Alnakshabandi AA, Asad D, Hammerum AM, Ng K, Klaassen C, Goessens WHF.

Microb Drug Resist. 2019 Jan/Feb;25(1):32-38. doi: 10.1089/mdr.2018.0036. Epub 2018 Aug 1.


Escherichia coli Sequence Type 410 Is Causing New International High-Risk Clones.

Roer L, Overballe-Petersen S, Hansen F, Schønning K, Wang M, Røder BL, Hansen DS, Justesen US, Andersen LP, Fulgsang-Damgaard D, Hopkins KL, Woodford N, Falgenhauer L, Chakraborty T, Samuelsen Ø, Sjöström K, Johannesen TB, Ng K, Nielsen J, Ethelberg S, Stegger M, Hammerum AM, Hasman H.

mSphere. 2018 Jul 18;3(4). pii: e00337-18. doi: 10.1128/mSphere.00337-18.


Vancomycin resistance in Enterococcus faecium isolated from Danish chicken meat is located on a pVEF4-like plasmid persisting in poultry for 18 years.

Leinweber H, Alotaibi SMI, Overballe-Petersen S, Hansen F, Hasman H, Bortolaia V, Hammerum AM, Ingmer H.

Int J Antimicrob Agents. 2018 Aug;52(2):283-286. doi: 10.1016/j.ijantimicag.2018.03.019. Epub 2018 Apr 3.


Complete Nucleotide Sequence of an Escherichia coli Sequence Type 410 Strain Carrying blaNDM-5 on an IncF Multidrug Resistance Plasmid and blaOXA-181 on an IncX3 Plasmid.

Overballe-Petersen S, Roer L, Ng K, Hansen F, Justesen US, Andersen LP, Stegger M, Hammerum AM, Hasman H.

Genome Announc. 2018 Feb 1;6(5). pii: e01542-17. doi: 10.1128/genomeA.01542-17.


CHTyper, a Web Tool for Subtyping of Extraintestinal Pathogenic Escherichia coli Based on the fumC and fimH Alleles.

Roer L, Johannesen TB, Hansen F, Stegger M, Tchesnokova V, Sokurenko E, Garibay N, Allesøe R, Thomsen MCF, Lund O, Hasman H, Hammerum AM.

J Clin Microbiol. 2018 Mar 26;56(4). pii: e00063-18. doi: 10.1128/JCM.00063-18. Print 2018 Apr. No abstract available.


Susceptibility of vancomycin-resistant and -sensitive Enterococcus faecium obtained from Danish hospitals to benzalkonium chloride, chlorhexidine and hydrogen peroxide biocides.

Alotaibi SMI, Ayibiekea A, Pedersen AF, Jakobsen L, Pinholt M, Gumpert H, Hammerum AM, Westh H, Ingmer H.

J Med Microbiol. 2017 Dec;66(12):1744-1751. doi: 10.1099/jmm.0.000642. Epub 2017 Nov 14.


Dissemination and Characteristics of a Novel Plasmid-Encoded Carbapenem-Hydrolyzing Class D β-Lactamase, OXA-436, Found in Isolates from Four Patients at Six Different Hospitals in Denmark.

Samuelsen Ø, Hansen F, Aasnæs B, Hasman H, Lund BA, Leiros HS, Lilje B, Janice J, Jakobsen L, Littauer P, Søes LM, Holzknecht BJ, Andersen LP, Stegger M, Andersen PS, Hammerum AM.

Antimicrob Agents Chemother. 2017 Dec 21;62(1). pii: e01260-17. doi: 10.1128/AAC.01260-17. Print 2018 Jan.


Prevalence of antimicrobial resistant Escherichia coli from patients with suspected urinary tract infection in primary care, Denmark.

Córdoba G, Holm A, Hansen F, Hammerum AM, Bjerrum L.

BMC Infect Dis. 2017 Oct 10;17(1):670. doi: 10.1186/s12879-017-2785-y.


Plasmid-borne colistin resistance gene mcr-3 in Salmonella isolates from human infections, Denmark, 2009-17.

Litrup E, Kiil K, Hammerum AM, Roer L, Nielsen EM, Torpdahl M.

Euro Surveill. 2017 Aug 3;22(31). pii: 30587. doi: 10.2807/1560-7917.ES.2017.22.31.30587.


Novel mcr-3 variant, encoding mobile colistin resistance, in an ST131 Escherichia coli isolate from bloodstream infection, Denmark, 2014.

Roer L, Hansen F, Stegger M, Sönksen UW, Hasman H, Hammerum AM.

Euro Surveill. 2017 Aug 3;22(31). doi: 22846.


Genetic characterisation confirms sporadic occurrence of vancomycin-resistant Enterococcus faecalis in Copenhagen, Denmark.

Holzknecht BJ, Pinholt M, Gumpert H, Hammerum AM, Westh H.

Int J Antimicrob Agents. 2017 Sep;50(3):501-502. doi: 10.1016/j.ijantimicag.2017.07.001. Epub 2017 Jul 12. No abstract available.


Development of a Web Tool for Escherichia coli Subtyping Based on fimH Alleles.

Roer L, Tchesnokova V, Allesøe R, Muradova M, Chattopadhyay S, Ahrenfeldt J, Thomsen MCF, Lund O, Hansen F, Hammerum AM, Sokurenko E, Hasman H.

J Clin Microbiol. 2017 Aug;55(8):2538-2543. doi: 10.1128/JCM.00737-17. Epub 2017 Jun 7.


Detection of the optrA gene in a clinical ST16 Enterococcus faecalis isolate in Denmark.

Vorobieva V, Roer L, Justesen US, Hansen F, Frimodt-Møller N, Hasman H, Hammerum AM.

J Glob Antimicrob Resist. 2017 Sep;10:12-13. doi: 10.1016/j.jgar.2017.05.002. Epub 2017 May 30. No abstract available.


Emergence of vanA Enterococcus faecium in Denmark, 2005-15.

Hammerum AM, Baig S, Kamel Y, Roer L, Pinholt M, Gumpert H, Holzknecht B, Røder B, Justesen US, Samulioniené J, Kjærsgaard M, Østergaard C, Holm A, Dzajic E, Søndergaard TS, Gaini S, Edquist P, Alm E, Lilje B, Westh H, Stegger M, Hasman H.

J Antimicrob Chemother. 2017 Aug 1;72(8):2184-2190. doi: 10.1093/jac/dkx138.


[Infection with carbapenemase-producing organisms after cosmetic surgery at a hospital abroad].

Andrews V, Hammerum AM, Dohrn N, Holzknecht BJ.

Ugeskr Laeger. 2017 Mar 27;179(13). pii: V12160880. Danish.


WGS-based surveillance of third-generation cephalosporin-resistant Escherichia coli from bloodstream infections in Denmark.

Roer L, Hansen F, Thomsen MCF, Knudsen JD, Hansen DS, Wang M, Samulioniené J, Justesen US, Røder BL, Schumacher H, Østergaard C, Andersen LP, Dzajic E, Søndergaard TS, Stegger M, Hammerum AM, Hasman H.

J Antimicrob Chemother. 2017 Jul 1;72(7):1922-1929. doi: 10.1093/jac/dkx092.


Detection of mcr-1-encoding plasmid-mediated colistin-resistant Salmonella isolates from human infection in Denmark.

Torpdahl M, Hasman H, Litrup E, Skov RL, Nielsen EM, Hammerum AM.

Int J Antimicrob Agents. 2017 Feb;49(2):261-262. doi: 10.1016/j.ijantimicag.2016.11.010. Epub 2017 Jan 3. No abstract available.


Characterization of a novel blaIMP gene, blaIMP-58, using whole genome sequencing in a Pseudomonas putida isolate detected in Denmark.

Holmgaard DB, Hansen F, Hasman H, Justesen US, Hammerum AM.

Diagn Microbiol Infect Dis. 2017 Jan;87(1):68-70. doi: 10.1016/j.diagmicrobio.2016.10.002. Epub 2016 Oct 7.


Polyclonal spread of vanA Enterococcus faecium in Central Denmark Region, 2009-2013, investigated using PFGE, MLST and WGS.

Landerslev KG, Jakobsen L, Olsen SS, Pedersen MB, Kristensen B, Lemming LE, Wang M, Kjærsgaard M, Stegger M, Hasman H, Hammerum AM.

Int J Antimicrob Agents. 2016 Dec;48(6):767-768. doi: 10.1016/j.ijantimicag.2016.09.001. Epub 2016 Sep 28. No abstract available.


Fecal carriage of extended-spectrum and AmpC β-lactamase-producing Enterobacteriaceae in surgical patients before and after antibiotic prophylaxis.

Jakobsen L, Kuhn KG, Hansen F, Skov RL, Hammerum AM, Littauer PJ, Thorlacius-Ussing O, Gebuhr PH, Knudsen JD, Schønheyder HC.

Diagn Microbiol Infect Dis. 2016 Nov;86(3):316-321. doi: 10.1016/j.diagmicrobio.2016.07.028. Epub 2016 Aug 3.


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.


Use of WGS data for investigation of a long-term NDM-1-producing Citrobacter freundii outbreak and secondary in vivo spread of blaNDM-1 to Escherichia coli, Klebsiella pneumoniae and Klebsiella oxytoca.

Hammerum AM, Hansen F, Nielsen HL, Jakobsen L, Stegger M, Andersen PS, Jensen P, Nielsen TK, Hansen LH, Hasman H, Fuglsang-Damgaard D.

J Antimicrob Chemother. 2016 Nov;71(11):3117-3124. Epub 2016 Aug 1.


High consumption of tetracyclines for acne treatment among young Danish adults.

Kuhn KG, Laursen M, Hammerum AM, Skov RL.

Infect Dis (Lond). 2016 Nov-Dec;48(11-12):808-12. doi: 10.1080/23744235.2016.1205214. Epub 2016 Jul 6.


OXA-Carbapenemases Present in Clinical Acinetobacter baumannii-calcoaceticus Complex Isolates from Patients in Kurdistan Region, Iraq.

Ganjo AR, Maghdid DM, Mansoor IY, Kok DJ, Severin JA, Verbrugh HA, Kreft D, Fatah MH, Alnakshabandi AA, Dlnya A, Hammerum AM, Ng K, Goessens W.

Microb Drug Resist. 2016 Dec;22(8):627-637. Epub 2016 Mar 22.


Detection of mcr-1 encoding plasmid-mediated colistin-resistant Escherichia coli isolates from human bloodstream infection and imported chicken meat, Denmark 2015.

Hasman H, Hammerum AM, Hansen F, Hendriksen RS, Olesen B, Agersø Y, Zankari E, Leekitcharoenphon P, Stegger M, Kaas RS, Cavaco LM, Hansen DS, Aarestrup FM, Skov RL.

Euro Surveill. 2015;20(49). doi: 10.2807/1560-7917.ES.2015.20.49.30085. Erratum in: Euro Surveill. 2015;20(50). doi: 10.2807/1560-7917.ES.2015.20.50.30091.


Isolation of an NDM-5-producing ST16 Klebsiella pneumoniae from a Dutch patient without travel history abroad, August 2015.

Bathoorn E, Rossen JW, Lokate M, Friedrich AW, Hammerum AM.

Euro Surveill. 2015;20(41). doi: 10.2807/1560-7917.ES.2015.20.41.30040.


Investigation of a possible outbreak of NDM-5-producing ST16 Klebsiella pneumoniae among patients in Denmark with no history of recent travel using whole-genome sequencing.

Hammerum AM, Hansen F, Olesen B, Struve C, Holzknecht BJ, Andersen PS, Thye AM, Jakobsen L, Røder BL, Stegger M, Hansen DS.

J Glob Antimicrob Resist. 2015 Sep;3(3):219-221. doi: 10.1016/j.jgar.2015.05.003. Epub 2015 Jun 29. No abstract available.


Detection of Klebsiella pneumoniae co-producing NDM-7 and OXA-181, Escherichia coli producing NDM-5 and Acinetobacter baumannii producing OXA-23 in a single patient.

Hammerum AM, Littauer P, Hansen F.

Int J Antimicrob Agents. 2015 Nov;46(5):597-8. doi: 10.1016/j.ijantimicag.2015.07.008. Epub 2015 Aug 18. No abstract available.


Use of whole-genome sequencing for characterisation of a ST119 NDM-1-producing Acinetobacter pittii from a patient in Denmark with no history of recent travel.

Hammerum AM, Hansen F, Littauer P.

Int J Antimicrob Agents. 2015 Sep;46(3):351-2. doi: 10.1016/j.ijantimicag.2015.05.005. Epub 2015 Jun 18. No abstract available.


Multiple hospital outbreaks of vanA Enterococcus faecium in Denmark, 2012-13, investigated by WGS, MLST and PFGE.

Pinholt M, Larner-Svensson H, Littauer P, Moser CE, Pedersen M, Lemming LE, Ejlertsen T, Søndergaard TS, Holzknecht BJ, Justesen US, Dzajic E, Olsen SS, Nielsen JB, Worning P, Hammerum AM, Westh H, Jakobsen L.

J Antimicrob Chemother. 2015 Sep;70(9):2474-82. doi: 10.1093/jac/dkv142. Epub 2015 Jun 1.


Investigation of a possible outbreak of carbapenem-resistant Acinetobacter baumannii in Odense, Denmark using PFGE, MLST and whole-genome-based SNPs.

Hammerum AM, Hansen F, Skov MN, Stegger M, Andersen PS, Holm A, Jakobsen L, Justesen US.

J Antimicrob Chemother. 2015 Jul;70(7):1965-8. doi: 10.1093/jac/dkv072. Epub 2015 Mar 19.


Use of whole-genome sequencing for detection of the spread of VIM-4-producing Escherichia coli between two patients in Denmark.

Jakobsen L, Hansen F, Stegger M, Andersen PS, Hammerum AM, Fuglsang-Damgaard D.

Int J Antimicrob Agents. 2015 Mar;45(3):327-9. doi: 10.1016/j.ijantimicag.2014.12.003. Epub 2014 Dec 22. No abstract available.


Characterisation of an IMP-7-producing ST357 Pseudomonas aeruginosa isolate detected in Denmark using whole genome sequencing.

Hammerum AM, Jakobsen L, Hansen F, Stegger M, Sørensen LA, Andersen PS, Wang M.

Int J Antimicrob Agents. 2015 Feb;45(2):200-1. doi: 10.1016/j.ijantimicag.2014.11.002. Epub 2014 Nov 29. No abstract available.


Characterization of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli obtained from Danish pigs, pig farmers and their families from farms with high or no consumption of third- or fourth-generation cephalosporins.

Hammerum AM, Larsen J, Andersen VD, Lester CH, Skovgaard Skytte TS, Hansen F, Olsen SS, Mordhorst H, Skov RL, Aarestrup FM, Agersø Y.

J Antimicrob Chemother. 2014 Oct;69(10):2650-7. doi: 10.1093/jac/dku180. Epub 2014 Jun 7.


Detection of NDM-2-producing Acinetobacter baumannii and VIM-producing Pseudomonas aeruginosa in Palestine.

Sjölander I, Hansen F, Elmanama A, Khayyat R, Abu-Zant A, Hussein A, Taha AA, Hammerum AM, Ciofu O.

J Glob Antimicrob Resist. 2014 Jun;2(2):93-97. doi: 10.1016/j.jgar.2013.11.002. Epub 2013 Nov 23.


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.


The association between demographic factors and increased antibiotic consumption in Denmark 2001 to 2010.

Gaardbo Kuhn K, Hammerum AM, Jensen US.

Scand J Infect Dis. 2014 Aug;46(8):599-604. doi: 10.3109/00365548.2014.912347. Epub 2014 May 16.


Characterization of third-generation cephalosporin-resistant Escherichia coli from bloodstream infections in Denmark.

Hansen F, Olsen SS, Heltberg O, Justesen US, Fuglsang-Damgaard D, Knudsen JD, Hammerum AM.

Microb Drug Resist. 2014 Aug;20(4):316-24. doi: 10.1089/mdr.2013.0157. Epub 2014 Feb 11.


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