plasmids carrying ESBL and mcr-1 genes
The objective of the present study was to investigate the mobile genetic supports responsible for the spread of these resistance genes among Escherichia coli in healthy broilers in Lebanon.Twenty-nine conjugative IncFII plasmids harboured the extended-spectrum beta-lactamase genes blaCTX-M-3 or blaCTX-M-55.The mobile colistin resistance genes mcr-1.1 and mcr-1.26 were carried by IncX4 and IncI2 plasmids. One E. coli isolate, the ISEcp1-blaCTX-M-55 transposable unit was found integrated in a mcr-1.26-carrying IncX4 plasmid.