Ten IMP-8-producing Escherichia coli isolates were recovered from the surveillance cultures of a neonatal intensive care unit, of which eight were clonally related. A 168.2-kb-blaIMP-8 plasmid was fully sequenced, and it corresponded to the recently described IncA/C1-ST13. This plasmid was detected in all isolates, even in those no clonally related. One unrelated isolate was also resistant to colistin and positive for mcr-1. This marker was located in a 62.7-kb-IncI2 plasmid, which was also fully sequenced.
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