Travelers Can Import Colistin-Resistant Enterobacteriaceae, Including Those Possessing the Plasmid-Mediated mcr-1 Gene

Bernasconi, Odette Joëlle; Kuenzli, Esther; Pires, João; Tinguely, Regula; Carattoli, Alessandra; Hatz, Christoph; Perreten, Vincent; Endimiani, Andrea (2016). Travelers Can Import Colistin-Resistant Enterobacteriaceae, Including Those Possessing the Plasmid-Mediated mcr-1 Gene. Antimicrobial agents and chemotherapy, 60(8), pp. 5080-5084. American Society for Microbiology 10.1128/AAC.00731-16

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Stools of 38 travelers returning from India were screened for extended-spectrum cephalosporin- and carbapenem-resistant Enterobacteriaceae implementing standard selective plates. Twenty-six (76.3%) people resulted colonized with CTX-M or DHA producers, but none of the strains was colistin-resistant and/or mcr-1-positive. Nevertheless, using an overnight enrichment and CHROMagarTM Orientation plates supplemented with colistin, four people (10.5%) were found colonized with colistin-resistant Escherichia coli. One cephalosporin-susceptible ST10 strain carried a 4211-bp ISApl1-mcr-1-ISApl1 element in an IncHI2 plasmid backbone.

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