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IncX3 Epidemic Plasmid Carrying blaNDM-5 in Escherichia coli from Swine in Multiple Geographic Areas in China

ABSTRACT Six imported pigs originating from Guangdong, Henan, and Hunan provinces in China during October 2015 to February 2017 were cultured and found to be positive for meropenem-resistant Escherichia coli. The samples yielded 9 E. coli isolates of diverse sequence types carrying blaNDM-5 on IncX3 (8 isolates from 5 farms) or IncFII (1 isolate from 1 farm) plasmids. The mcr-1 gene was coharbored by 4 isolates. The IncX3 plasmids (∼46 kb) carrying blaNDM-5 were identical or nearly identical to each other.