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Claus Østergaard

Observed names: C. Østergaard, C. Østergård, Østergaard, Claus
Institution: Lillebaelt Hospital
ORCID: 0000-0001-8268-3762
Observed ORCID: 0000-0001-8268-3762
OpenAlex ID: A5037897396
Increase in invasive group A streptococcal infections and emergence of novel, rapidly expanding sub-lineage of the virulent Streptococcus pyogenes M1 clone, Denmark, 2023
2023 · Thor Bech Johannesen, Charlotte Munkstrup, et al. · Eurosurveillance · 135
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Update from a 12-Year Nationwide Fungemia Surveillance: Increasing Intrinsic and Acquired Resistance Causes Concern
2017 · K. M. T. Astvad, H. K. Johansen, et al. · Journal of Clinical Microbiology · 129
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Bacteraemia as a result of Campylobacter species: a population-based study of epidemiology and clinical risk factors
2009 · H. Nielsen, K.K. Hansen, et al. · Clinical Microbiology and Infection · 112
Emergence of Livestock-Associated Methicillin-Resistant Staphylococcus aureus Bloodstream Infections in Denmark
2017 · Jesper Larsen, Andreas Petersen, et al. · Clinical Infectious Diseases · 96
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WGS-based surveillance of third-generation cephalosporin-resistant Escherichia coli from bloodstream infections in Denmark
2017 · Louise Roer, Frank Hansen, et al. · Journal of Antimicrobial Chemotherapy · 91
Treatment of bacterial vaginosis in pregnancy in order to reduce the risk of spontaneous preterm delivery – a clinical recommendation
2016 · Thor Haahr, Anne S. Ersbøll, et al. · Acta Obstetricia Et Gynecologica Scandinavica · 81
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Wastewater treatment plant workers’ exposure and methods for risk evaluation of their exposure
2020 · Rui Lu, Margit W. Frederiksen, et al. · Ecotoxicology and Environmental Safety · 66
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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
2019 · Anette M Hammerum, Ulrik S Justesen, et al. · Eurosurveillance · 65
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Emergence of vanA Enterococcus faecium in Denmark, 2005–15
2017 · Anette M. Hammerum, Sharmin Baig, et al. · Journal of Antimicrobial Chemotherapy · 60
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Evaluation of point-of-care multiplex polymerase chain reaction in guiding antibiotic treatment of patients acutely admitted with suspected community-acquired pneumonia in Denmark: A multicentre randomised controlled trial
2023 · Mariana Bichuette Cartuliares, Flemming Schønning Rosenvinge, et al. · PLoS Medicine · 49
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One Day in Denmark: Comparison of Phenotypic and Genotypic Antimicrobial Susceptibility Testing in Bacterial Isolates From Clinical Settings
2022 · Ana Rita Rebelo, Valeria Bortolaia, et al. · Frontiers in Microbiology · 49
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Rapid first-line discrimination of methicillin resistant Staphylococcus aureus strains using MALDI-TOF MS
2015 · Claus Østergaard, Sanne G.K. Hansen, et al. · International Journal of Medical Microbiology · 46
Surveillance of vancomycin-resistant enterococci reveals shift in dominating clusters from vanA to vanB Enterococcus faecium clusters, Denmark, 2015 to 2022
2024 · Anette M Hammerum, Kasper Thystrup Karstensen, et al. · Eurosurveillance · 44
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Surveillance of OXA-244-producing Escherichia coli and epidemiologic investigation of cases, Denmark, January 2016 to August 2019
2020 · Anette M Hammerum, Lone Jannok Porsbo, et al. · Eurosurveillance · 39
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International travel as source of a hospital outbreak with an unusual meticillin-resistant Staphylococcus aureus clonal complex 398, Denmark, 2016
2019 · Jens Kjølseth Møller, Anders Rhod Larsen, et al. · Eurosurveillance · 38
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Characterisation of carbapenemase-producing Acinetobacter baumannii isolates from danish patients 2014–2021: detection of a new international clone – IC11
2023 · Frank Hansen, Lone Jannok Porsbo, et al. · International Journal of Antimicrobial Agents · 34
Improved diagnostics of infectious diseases in emergency departments: a protocol of a multifaceted multicentre diagnostic study
2021 · Helene Skjøt-Arkil, Anne Heltborg, et al. · BMJ Open · 29
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Performance of the EUCAST disc diffusion method and two MIC methods in detection of Enterobacteriaceae with reduced susceptibility to meropenem: the NordicAST CPE study
2018 · Bjørg Haldorsen, Christian G Giske, et al. · Journal of Antimicrobial Chemotherapy · 21
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High rates of reduced susceptibility in the Bacteroides fragilis group isolated from blood cultures – The first national survey in Denmark
2013 · Ulrik S. Justesen, Frank Hansen, et al. · International Journal of Antimicrobial Agents · 19
Molecular characterization of Danish ESBL/AmpC-producing Klebsiella pneumoniae from bloodstream infections, 2018
2020 · Sanne Kjær Hansen, Hülya Kaya, et al. · Journal of Global Antimicrobial Resistance · 16
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One Day in Denmark: Nationwide point-prevalence survey of human bacterial isolates and comparison of classical and whole-genome sequence-based species identification methods
2022 · Ana Rita Rebelo, Tobias Ibfelt, et al. · PLoS ONE · 15
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Danish Whole-Genome-Sequenced Candida albicans and Candida glabrata Samples Fit into Globally Prevalent Clades
2021 · Judit Szarvas, Ana Rita Rebelo, et al. · Journal of Fungi · 15
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Characterization of Carbapenem Nonsusceptible Pseudomonas aeruginosa in Denmark: A Nationwide, Prospective Study
2013 · Frank Hansen, Helle Krogh Johansen, et al. · Microbial Drug Resistance · 15
Urine Flow Cytometry and Dipstick Analysis in Diagnosing Bacteriuria and Urinary Tract Infections among Adults in the Emergency Department—A Diagnostic Accuracy Trial
2024 · Mathias Amdi Hertz, Isik Somuncu Johansen, et al. · Diagnostics · 11
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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
2020 · Anette M. Hammerum, Caroline A.S. Lauridsen, et al. · International Journal of Antimicrobial Agents · 11
Works count: 49
Citation count: 1,346
H-index: 19
I10-index: 28
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