qnr, aac(6')-Ib-cr, qepA, and oqxAB genes were detected in 5.7%, 4.9%, 2.6%, and 20.2% of 1,022 Escherichia coli isolates from humans, animals, and the environment, respectively, collected between 1993 and 2010 in China. The prevalence of oqxAB in porcine isolates (51.0%) was significantly higher than that in other isolates. This is the first report of oqxAB-positive isolates from ducks and geese and as early as 1994 from chickens.
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