Journal
FRONTIERS IN MICROBIOLOGY
Volume 9, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2018.01880
Keywords
colistin resistance; mcr genes; ESBL (Extended Spectrum Beta-Lactamases); plasmids; whole genome sequencing; Salmonella Infantis; broilers; broiler meat
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Funding
- project Establishing Next Generation sequencing Ability for Genomic analysis in Europe (ENGAGE)
- European Food Safety Authority (EFSA) [GP/EFSA/AFSCO/2015/01/CT1]
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Colistin-resistance mediated by mobilisable and plasmid-borne mcr genes has emerged worldwide, threatening the efficacy of colistin, a last resort antibiotic increasingly used for treating human invasive infections by multidrug-resistant or extensively drug-resistant Enterobacteriaceae. In this study, we report the first evidence of mcr-1-mediated colistin resistance in four multidrug resistant (MDR) out of 324 Salmonella infantis from the Italian antimicrobial resistance (AMR) monitoring (2001-2017) in broilers and broiler meat. Two were also Extended Spectrum Beta-Lactamases (ESBL)-producing isolates. Characterization by whole genome sequencing (WGS), located mcr-1.1 on an incX4 plasmid. Phylogenetic analysis of these isolates with selected Italian S. Infantis previously isolated from animals, meat and human clinical cases with unknown epidemiological relationship, demonstrated that ESBL-producing, mcr-1-positive isolates belonged to the emerging pESI-like-positive-ESBL-producing clone described in Italy in 2015.
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