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A. Hammerum · SciRah

Researcher profile · Semantic Scholar

A. Hammerum

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A. Hammerum — researcher profile on SciRah

h-index: 54
Works: 217
Citations: 11K

Most-cited papers

Epidemic of carbapenem-resistant Klebsiella pneumoniae in Europe is driven by nosocomial spread
S. David, S. Reuter, S. Harris, C. Glasner +84 more
2019Nature Microbiology705 citations Open access
Semantic Scholar
DANMAP 2016 - Use of antimicrobial agents and occurrence of antimicrobial resistance in bacteria from food animals, food and humans in Denmark
Birgitte Borck Høg, H. Korsgaard, Ute Wolff Sönksen, F. Bager +20 more
2017676 citations
Semantic Scholar
Detection of mcr-1 encoding plasmid-mediated colistin-resistant Escherichia coli isolates from human bloodstream infection and imported chicken meat, Denmark 2015.
H. Hasman, A. Hammerum, F. Hansen, R. Hendriksen +10 more
2015Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin411 citations Open access
Semantic Scholar
Update on prevalence and mechanisms of resistance to linezolid, tigecycline and daptomycin in enterococci in Europe: Towards a common nomenclature.
Jennifer K. Bender, V. Cattoir, Kristin Hegstad, E. Sadowy +12 more
2018Drug resistance updates247 citations Open access
Semantic Scholar
Escherichia coli Sequence Type 410 Is Causing New International High-Risk Clones
L. Roer, Søren Overballe-Petersen, F. Hansen, K. Schønning +19 more
2018Msphere220 citations Open access
Semantic Scholar
Development of a Web Tool for Escherichia coli Subtyping Based on fimH Alleles
L. Roer, V. Tchesnokova, R. Allesøe, M. Muradova +8 more
2017Journal of Clinical Microbiology188 citations Open access
Semantic Scholar
Multiple hospital outbreaks of vanA Enterococcus faecium in Denmark, 2012-13, investigated by WGS, MLST and PFGE.
M. Pinholt, Hanna M. Larner-Svensson, Pia Littauer, C. Moser +13 more
2015Journal of Antimicrobial Chemotherapy108 citations Open access
Semantic Scholar
A role for ColV plasmids in the evolution of pathogenic Escherichia coli ST58
Cameron J. Reid, M. Cummins, S. Börjesson, M. Brouwer +14 more
2022Nature Communications85 citations Open access
Semantic Scholar
WGS-based surveillance of third-generation cephalosporin-resistant Escherichia coli from bloodstream infections in Denmark
L. Roer, F. Hansen, M. Thomsen, J. Knudsen +13 more
2017Journal of Antimicrobial Chemotherapy80 citations Open access
Semantic Scholar
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.
H. Hasman, P. L. C. Clausen, H. Kaya, F. Hansen +8 more
2019Journal of Antimicrobial Chemotherapy79 citations
Semantic Scholar
Plasmid-borne colistin resistance gene mcr-3 in Salmonella isolates from human infections, Denmark, 2009–17
Eva Litrup, Kristoffer Kiil, A. Hammerum, L. Roer +2 more
2017Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin76 citations Open access
Semantic Scholar
Novel mcr-3 variant, encoding mobile colistin resistance, in an ST131 Escherichia coli isolate from bloodstream infection, Denmark, 2014
L. Roer, F. Hansen, M. Stegger, Ute Wolff Sönksen +2 more
2017Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin66 citations Open access
Semantic Scholar
Prevalence of antimicrobial resistant Escherichia coli from patients with suspected urinary tract infection in primary care, Denmark
G. Cordoba, A. Holm, F. Hansen, A. Hammerum +1 more
2017BMC Infectious Diseases56 citations Open access
Semantic Scholar
Investigation of a possible outbreak of carbapenem-resistant Acinetobacter baumannii in Odense, Denmark using PFGE, MLST and whole-genome-based SNPs.
A. Hammerum, F. Hansen, M. Skov, M. Stegger +4 more
2015Journal of Antimicrobial Chemotherapy56 citations Open access
Semantic Scholar
The global dissemination of hospital clones of Enterococcus faecium
S. V. van Hal, R. Willems, T. Gouliouris, S. Ballard +12 more
2021Genome Medicine55 citations Open access
Semantic Scholar
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
A. Hammerum, U. Justesen, M. Pinholt, L. Roer +16 more
2019Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin55 citations Open access
Semantic Scholar
CHTyper, a Web Tool for Subtyping of Extraintestinal Pathogenic Escherichia coli Based on the fumC and fimH Alleles
L. Roer, T. Johannesen, F. Hansen, M. Stegger +8 more
2018Journal of Clinical Microbiology54 citations Open access
Semantic Scholar
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.
A. Hammerum, F. Hansen, H. L. Nielsen, L. Jakobsen +7 more
2016Journal of Antimicrobial Chemotherapy53 citations
Semantic Scholar
Emergence of vanA Enterococcus faecium in Denmark, 2005–15
A. Hammerum, Sharmin Baig, Yasmin Kamel, L. Roer +18 more
2017Journal of Antimicrobial Chemotherapy52 citations Open access
Semantic Scholar
Susceptibility of vancomycin-resistant and -sensitive Enterococcus faecium obtained from Danish hospitals to benzalkonium chloride, chlorhexidine and hydrogen peroxide biocides.
Sulaiman M. I. Alotaibi, Alafate Ayibiekea, A. Pedersen, L. Jakobsen +5 more
2017Journal of Medical Microbiology51 citations Open access
Semantic Scholar
Cross-border spread of blaNDM-1- and blaOXA-48-positive Klebsiella pneumoniae: a European collaborative analysis of whole genome sequencing and epidemiological data, 2014 to 2019
C. Ludden, F. Lötsch, E. Alm, Narender Kumar +29 more
2020Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin46 citations Open access
Semantic Scholar
Emergence of Enteroaggregative Escherichia coli within the ST131 Lineage as a Cause of Extraintestinal Infections
E. J. Boll, Søren Overballe-Petersen, H. Hasman, L. Roer +17 more
2018mBio43 citations Open access
Semantic Scholar
Detection of mcr-1-encoding plasmid-mediated colistin-resistant Salmonella isolates from human infection in Denmark.
M. Torpdahl, H. Hasman, Eva Litrup, R. Skov +2 more
2017International Journal of Antimicrobial Agents40 citations
Semantic Scholar
Multilevel population genetic analysis of vanA and vanB Enterococcus faecium causing nosocomial outbreaks in 27 countries (1986-2012).
A. Freitas, A. Tedim, M. Francia, L. Jensen +12 more
2016Journal of Antimicrobial Chemotherapy39 citations Open access
Semantic Scholar
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
L. Roer, Søren Overballe-Petersen, F. Hansen, T. Johannesen +12 more
2018Journal of Antimicrobial Chemotherapy38 citations
Semantic Scholar
The interplay between community and hospital Enterococcus faecium clones within health-care settings: a genomic analysis
S. V. van Hal, R. Willems, T. Gouliouris, S. Ballard +12 more
2022The Lancet Microbe36 citations Open access
Semantic Scholar
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.
A. Valcek, L. Roer, Søren Overballe-Petersen, F. Hansen +7 more
2019Journal of Antimicrobial Chemotherapy36 citations Open access
Semantic Scholar
Isolation of an NDM-5-producing ST16 Klebsiella pneumoniae from a Dutch patient without travel history abroad, August 2015.
E. Bathoorn, J. Rossen, M. Lokate, A. Friedrich +1 more
2015Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin35 citations Open access
Semantic Scholar
Surveillance of vancomycin-resistant enterococci reveals shift in dominating clusters from vanA to vanB Enterococcus faecium clusters, Denmark, 2015 to 2022
A. Hammerum, Kasper Thystrup Karstensen, L. Roer, H. Kaya +15 more
2024Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin33 citations Open access
Semantic Scholar
Characterization of Carbapenemase producing Acinetobacter baumannii Isolates from Danish Patients 2014-2021 - Detection of a New International Clone - IC11.
F. Hansen, L. J. Porsbo, T. Frandsen, Ayşe Nur Sarı Kaygısız +14 more
2023International Journal of Antimicrobial Agents31 citations Open access
Semantic Scholar
Surveillance of OXA-244-producing Escherichia coli and epidemiologic investigation of cases, Denmark, January 2016 to August 2019
A. Hammerum, L. J. Porsbo, F. Hansen, L. Roer +14 more
2020Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin31 citations Open access
Semantic Scholar
OXA-Carbapenemases Present in Clinical Acinetobacter baumannii-calcoaceticus Complex Isolates from Patients in Kurdistan Region, Iraq
Aryan R. Ganjo, D. M. Maghdid, I. Mansoor, D. Kok +9 more
2016Microbial Drug Resistance31 citations Open access
Semantic Scholar
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.
A. Hammerum, F. Hansen, B. Olesen, C. Struve +7 more
2015Journal of Global Antimicrobial Resistance31 citations
Semantic Scholar
VirulenceFinder for Enterococcus faecium and Enterococcus lactis: an enhanced database for detection of putative virulence markers by using whole-genome sequencing data
L. Roer, H. Kaya, A. Tedim, C. Novais +6 more
2024Microbiology spectrum30 citations Open access
Semantic Scholar
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.
A. Hammerum, Pia Littauer, F. Hansen
2015International Journal of Antimicrobial Agents30 citations
Semantic Scholar
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
Søren Overballe-Petersen, L. Roer, K. Ng, F. Hansen +5 more
2018Genome Announcements29 citations Open access
Semantic Scholar
Vancomycin resistance in Enterococcus faecium isolated from Danish chicken meat is located on a pVEF4-like plasmid persisting in poultry for 18 years.
Helena Leinweber, Sulaiman M. I. Alotaibi, Søren Overballe-Petersen, F. Hansen +4 more
2018International Journal of Antimicrobial Agents27 citations Open access
Semantic Scholar
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
Ø. Samuelsen, F. Hansen, B. Aasnæs, H. Hasman +12 more
2017Antimicrobial Agents and Chemotherapy27 citations Open access
Semantic Scholar
Characterization of Diarrheagenic Enteroaggregative Escherichia coli in Danish Adults—Antibiotic Treatment Does Not Reduce Duration of Diarrhea
Betina Hebbelstrup Jensen, Camilla Adler Sørensen, Stig Hebbelstrup Rye Rasmussen, Dorthe Rejkjær Holm +9 more
2018Frontiers in Cellular and Infection Microbiology26 citations Open access
Semantic Scholar
Epidemiological situation, laboratory capacity and preparedness for carbapenem-resistant Acinetobacter baumannii in Europe, 2019
F. Lötsch, B. Albiger, D. Monnet, M. Struelens +69 more
2020Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin24 citations Open access
Semantic Scholar
Dissemination of extensively drug-resistant NDM-producing Providencia stuartii in Europe linked to patients transferred from Ukraine, March 2022 to March 2023
Sandra Witteveen, Jörg B. Hans, R. Izdebski, H. Hasman +37 more
2024Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin23 citations Open access
Semantic Scholar
Emergence of Escherichia coli ST131 carrying carbapenemase genes, European Union/European Economic Area, August 2012 to May 2024
Anke Kohlenberg, Olov Svartström, Petra Apfalter, R. Hartl +33 more
2024Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin22 citations Open access
Semantic Scholar
An ST405 NDM-4-producing Escherichia coli isolated from a Danish patient previously hospitalized in Vietnam.
L. Jakobsen, A. Hammerum, F. Hansen, D. Fuglsang-Damgaard
2014Journal of Antimicrobial Chemotherapy21 citations
Semantic Scholar
Detection of the optrA gene in a clinical ST16 Enterococcus faecalis isolate in Denmark.
V. Vorobieva, L. Roer, U. Justesen, F. Hansen +3 more
2017Journal of Global Antimicrobial Resistance20 citations
Semantic Scholar
PME and Other ESBL-Positive Multiresistant Pseudomonas aeruginosa Isolated from Hospitalized Patients in the Region of Kurdistan, Iraq
Sebastian van Burgh, D. M. Maghdid, Aryan R. Ganjo, I. Mansoor +8 more
2019Microbial Drug Resistance19 citations
Semantic Scholar
Escherichia coli Causing Recurrent Urinary Tract Infections: Comparison to Non-Recurrent Isolates and Genomic Adaptation in Recurrent Infections
K. L. Nielsen, M. Stegger, Kristoffer Kiil, B. Lilje +8 more
2021Microorganisms18 citations Open access
Semantic Scholar
Using core genome MLST typing for vancomycin-resistant Enterococcus faecium isolates to guide infection control interventions and end an outbreak.
S. K. Hansen, Lise Andersen, M. Detlefsen, A. Holm +5 more
2021Journal of Global Antimicrobial Resistance17 citations Open access
Semantic Scholar
Characterization of Carbapenem Nonsusceptible Pseudomonas aeruginosa in Denmark: A Nationwide, Prospective Study
F. Hansen, H. Johansen, C. Østergaard, M. Arpi +10 more
2014Microbial Drug Resistance17 citations
Semantic Scholar
Genotypic characterization of carbapenemase-producing organisms obtained in Denmark from patients associated with the war in Ukraine.
Rasmus Skjold Stolberg, F. Hansen, L. J. Porsbo, Kasper Thystrup Karstensen +11 more
2023Journal of Global Antimicrobial Resistance15 citations Open access
Semantic Scholar
Typing of vancomycin-resistant enterococci with MALDI-TOF mass spectrometry in a nosocomial outbreak setting.
B. Holzknecht, R. Dargis, M. Pedersen, M. Pinholt +11 more
2018Clinical Microbiology and Infection15 citations Open access
Semantic Scholar

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L. Roer×23
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Ø. Samuelsen×7

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