A 2-year national genomic screening in the Czech Republic identified a notable prevalence of the New Delhi metallo-β-lactamase 5 (NDM-5)-producing Escherichia coli sequence type 38 (ST38) in the city of Brno. Forty-two ST38 E. coli isolates harbored the blaNDM-5 gene on the chromosome. Virulence factors confirmed the persistence of these isolates through biofilm formation. Single Nucleotide Polymorphisms (SNPs)-based phylogeny and CRISPR assay typing showed minimal genomic variations, implying a clonally driven outbreak. Results suggest that this high-risk clone may impose a nationwide problem.

Central European Institute of Technology University of Veterinary Sciences Brno Brno Czech Republic

Department of Biology and Wildlife Diseases Faculty of Veterinary Hygiene and Ecology University of Veterinary Sciences Brno Brno Czech Republic

Department of Clinical Microbiology and Immunology Institute of Laboratory Medicine The University Hospital Brno Brno Czech Republic

Department of Microbiology Faculty of Medicine University Hospital in Pilsen Charles University Pilsen Czech Republic

Department of Microbiology University Hospital of Larissa Larissa Greece

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