Dissemination of New Delhi metallo-β-lactamase-1-producing Acinetobacter baumannii in Europe

Multidrug-resistant and New Delhi metallo-β-lactamase I (NDM-I) -producing Acinetobacter baumannii are increasingly reported. A collection of five NDM-I-positive A. baumannii isolates recovered in four European countries were analysed. Genotyping was performed by pulsed-field gel electrophoresis, multiplex PCR sequence typing, Diversilab and multilocus sequence typing. Three distinct sequence types were identified. All isolates harboured a chromosomally located blaNDM-1. gene within a Tn/25-like transposon. One isolate co-expressed another unrelated carbapenemase OXA-23. This report constitutes the first epidemiological study of NDM-I-producing A. baumannii from four countries.