Table 1.

The basic information and MICs (mg/L) of mcr-positive isolates and their transconjugants in this study.

Isolates	Gene	Serovar	STs a	Antimicrobials b
				KAN	CIP	MEM	AMP	CL	ENR	TET	CFF
SC2014107	mcr-1	Orion	684	8	≤0.25	≤0.25	8	8	≤0.25	4	≤0.25
SC2014238	mcr-1	Meleagridis	463	4	≤0.25	≤0.25	>128	4	≤0.25	8	>128
SC2016025	mcr-1	I 4,[5],12:i:-	34	128	4	≤0.25	>128	8	2	128	>128
SC2016042	mcr-1	I 4,[5],12:i:-	34	8	≤0.25	≤0.25	>128	8	≤0.25	128	8
SC2016090	mcr-1	I 4,[5],12:i:-	34	8	≤0.25	≤0.25	>128	4	2	64	>128
SC2016091	mcr-3	I 4,[5],12:i:-	34	8	≤0.25	≤0.25	>128	8	≤0.25	128	>128
SC2016290	mcr-3	I 4,[5],12:i:-	34	4	≤0.25	≤0.25	>128	8	≤0.25	32	>128
SC2017030	mcr-1	I 4,[5],12:i:-	34	>128	≤0.25	≤0.25	>128	8	≤0.25	64	>128
SC2017057	mcr-1	I 4,[5],12:i:-	34	>128	≤0.25	≤0.25	>128	1	≤0.25	16	128
SC2017100	mcr-1	I 4,[5],12:i:-	34	2	0.5	≤0.25	>128	4	≤0.25	32	>128
SC2017167	mcr-1	I 4,[5],12:i:-	34	>128	≤0.25	≤0.25	>128	4	≤0.25	64	>128
SC2017297	mcr-1	I 4,[5],12:i:-	34	>128	≤0.25	≤0.25	>128	8	1	32	>128
cSC2014107	mcr-1	/	/	1	≤0.25	≤0.25	8	2	1	0.5	≤0.25
cSC2014238	mcr-1	/	/	1	≤0.25	≤0.25	32	2	0.5	0.5	0.5
cSC2016025	mcr-1	/	/	4	0.5	≤0.25	>128	2	1	32	128
cSC2016042	mcr-1	/	/	2	≤0.25	≤0.25	32	2	0.5	0.5	0.5
cSC2016090	mcr-1	/	/	4	≤0.25	≤0.25	>128	2	1	0.5	16
cSC2016091	mcr-3	/	/	1	≤0.25	≤0.25	>128	2	1	≤0.25	>128
cSC2016290	mcr-3	/	/	1	≤0.25	≤0.25	>128	2	0.5	4	>128
cSC2017030	mcr-1	/	/	>128	≤0.25	≤0.25	>128	2	0.5	32	32
cSC2017057	mcr-1	/	/	8	≤0.25	≤0.25	>128	2	0.5	32	64
cSC2017100	mcr-1	/	/	2	≤0.25	≤0.25	>128	2	0.5	0.5	16
cSC2017167	mcr-1	/	/	>128	≤0.25	≤0.25	>128	2	0.5	0.5	16
cSC2017297	mcr-1	/	/	>128	≤0.25	≤0.25	>128	1	0.5	16	64

^aSTs indicate sequence types.

^bKAN, kanamycin; CIP, ciprofloxacin; MEM, meropenem; AMP, ampicillin; CL, colistin; ENR, enrofloxacin; TET, tetracycline; CFF, ceftiofur.