Revealing mcr-1-positive ESBL-producing Escherichia coli strains among Enterobacteriaceae from food-producing animals (bovine, swine and poultry) and meat (bovine and swine), Portugal, 2010-2015

Clemente, Lurdes; Manageiro, Vera; Correia, Ivone; Amaro, Ana; Albuquerque, Teresa; Themudo, Patrícia; Ferreira, Eugénia; Caniça, Manuela

http://hdl.handle.net/10400.18/6584

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We screened 1840 Enterobacteriaceae isolates from food-producing animals, meat, meat products and animal feed, for the detection of plasmid-mediated colistin resistance, during 2010-2015. The mcr-1 gene was detected in 8.0% (97/1206) Escherichia coli and in 0.47% (3/634) Salmonella enterica isolates, with a high number of mcr-1 positive E. coli isolates (45.7%) being extended-spectrum β-lactamase or plasmid-mediated AmpC β-lactamase co-producers. No mcr-2 gene was detected. Our findings highlight the spread of mcr-1 genes within a wide-ranging sample of food-producing animals and meat, in Portugal.

Highlights: Spread of MCR-1 within a wide-ranging sample of food-producing animals and meat; Occurrence of mcr genes in E. coli isolates from turkeys, swine and broilers; High number of mcr positive E. coli isolates that were ESBL or PMAβ co-producers; First description of MCR-1-producing Salmonella Reading from bovine meat; New mcr-1.9 variant reported in an Escherichia coli from a swine.