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This study investigated the characteristics of Escherichia coli isolates carrying mcr-1-bla NDM from a chicken farm in China. Of the 78 E. coli isolates, 21 clonally unrelated isolates carried mcr-1-bla NDM . Diverse IncI2 plasmids disseminated mcr-1 , while the dissemination of bla NDM was mediated by diverse IncB/O plasmids. More striking was the colocalization of resistance genes mcr-1 and bla NDM-4 in an IncHI2/ST3 plasmid, which might pose a great challenge for public health.
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Liu et al. (2017) studied this question.
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