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Occurrence and molecular characteristics of antimicrobial resistance of Escherichia coli from broilers, pigs and meat products in Thailand and Cambodia provinces.
Microbiology and Immunology 2016 September
Nine hundred and forty-one samples were collected in Sa Keao, Thailand (n = 554) and Banteay Meanchey, Cambodia (n = 387) from July 2014 to January 2015. A total of 667 Escherichia coli isolates (381 isolates from Sa Keao and 286 isolates from Banteay Meanchey) were obtained and examined for antimicrobial susceptibility, class 1 integrons, ESBL genes and horizontal transfer of resistance determinants. Prevalence of E. coli in pig and broiler carcass samples from slaughterhouses and fresh markets was 36-85% in Sa Keao and 11-69% in Banteay Meanchey. The majority of these isolates were multidrug resistant (75.3%). Class 1 integrons were common in both Thai (47%) and Cambodian (62%) isolates, of which four resistance gene cassette arrays including aadA1, dfrA1-aadA1, dfrA12-aadA2 and aadA2-linF were identified. Class 1 integrons in two broiler isolates from Sa Keao (dfrA12-aadA2) and one broiler isolate from Banteay Meanchey (dfrA1-aadA1) were horizontally transferable. Sixteen isolates were confirmed to be ESBL-producing strains with ESBL gene blaCTX-M-15 , broad spectrum β-lactamase gene blaTEM-1 and the AmpC gene blaCMY-2 being detected. The blaTEM-1 gene was most prevalent and located on a conjugative plasmid.
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