Table 4.

Resistance of multidrug resistant ExPEC strains from poultry carcasses to antimicrobials commonly used in Brazilian farms.

Strain	Antimicrobials (μg/mL)
	Doxycycline		Neomycin		Enrofloxacin		Oxytetracycline
	MIC	MBC	MIC	MBC	MIC	MBC	MIC	MBC
4A	125	–	>1000	–	1,9	31.2	>1000	–
48A	31.2	–	>1000–	–	1,9	250	>1000	–
32	>1000	–	500	500	62.5	1000	250	250
44A	62.5	500	>1000	–	15.6	250	>1000	–
15C	62.5	1000	>1000	–	62.5	–	500	–
30C	1,9	250	500	500	1,9	1,9	1,9	500
48B	125	125	125	125	1,9	62.5	>1000	–
36A	1,9	500	250	500	1,9	500	>1000	–
43A	62.5	500	62.5	250	31.2	250	250	–
5B	62.5	500	>1000	–	1,9	1000	250	–
21C	125	500	500	1000	15.6	–	500	500
42C	31.2	–	125	250	3,9	500	1000	–
35	125	250	500	500	31.2	–	62.5	500
31C	125	500	250	250	15.6	1000	>1000	–
52B	31.2	–	500	–	7,8	500	500	–
55B	62.5	1000	>1000	–	31.2	1000	250	–
24A	62.5	250	>1000	–	125	–	>1000	–
54B	62.5	250	>1000	–	>1000	–	7,8	7,8
60A	62.5	500	>1000	–	15.6	1000	125	–
38B	125	125	>1000	–	62.5	125	125	125
37B	62.5	125	>1000	–	31.2	62.5	62.5	–
39B	15.6	62.5	500	500	7,8	7,8	>1000	–
46	62.5	125	500	500	31.2	250	>1000	–
41A	62.5	62.5	>1000	–	NT	NT	NT	NT
2B	125	125	125	125	31.2	31.2	1000	–
Resistance breakpoint	≥16		≥32		≥2		≥16