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Other reports noted detections in hospital patients, sick chickens, and retail meat samples.
In Portugal, 11 human samples tested positive, and in Brazil the isolates were from poultry not given polymyxins.
Researchers discover a new gene distinct from MCR-1 that can confer colistin resistance and dub it MCR-2.
Italian researchers, meanwhile, said they detected a variant of the MCR-1 gene.
The MCR-1 gene was most prevalent in poultry, with 10.7% of turkey isolates and 5.6% of broiler isolates testing positive.
One isolate was also resistant to beta-lactams, fluoroquinolones, and florfenicol.
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