TABLE 1.

MIC values of antibiotics against the E. coli strains used in this study.

E. coli	MIC of antibiotics (μg/mL)a
	ATCC25922	GZP8-8 (pig)	GZP10-8 (pig)	12a4 (pig)	12e5 (pig)	GZP13-4 (pig)	II-119 (human)	II-CX53 (human)
Tetracycline	4(S)	256(R)	128(R)	256(R)	256(R)	256(R)	256(R)	128(R)
Oxytetracycline	2(S)	16(R)	16(R)	16(R)	16(R)	256(R)	16(R)	512(R)
Chlortetracycline	8(S)	256(R)	256(R)	256(R)	128(R)	512(R)	512(R)	512(R)
Doxycycline	4(S)	128(R)	128(R)	128(R)	128(R)	64(R)	128(R)	128(R)
Ofloxacin	2(S)	32(R)	16(I)	32(R)	16(I)	32(R)	128(R)	16(I)
Norfloxacin	4(S)	256(R)	128(R)	128(R)	128(R)	256(R)	128(R)	128(R)
Ciprofloxacin	4(S)	128(R)	32(R)	32(R)	16(I)	32(R)	128(R)	32(R)
Florfenicol	8(S)	32(R)	32(R)	64(R)	32(R)	16(I)	256(R)	256(R)
Cefquinome	8(S)	1024(R)	16(I)	32(R)	8(S)	1024(R)	512(R)	16(I)
Ceftiofur	1(S)	512(R)	1(S)	2(S)	0.5(S)	512(R)	128(R)	1(S)

^aS, sensitive; I, intermediary; R, resistant.