. 2014 Oct 28;77(1):59–65. doi: 10.1292/jvms.13-0281

Table 1. Antimicrobial susceptibility profiles of uropathogenic Escherichia coli.

Class	Antimicrobial agents (mg/l)	NTUVH (n=69)			NCYUVTH (n=45)			Overall E. coli (n=114)

		MIC₅₀	MIC₉₀	R%^a,b)	MIC₅₀	MIC₉₀	R% ^a,b)	MIC₅₀	MIC₉₀	R% ^a,b)
Aminoglycosides	Amikacin	2	8	0	4	8	0	2	8	0
	Gentamicin	1	2	8.7	1	64	13.3	1	64	10.5
Cephalosporins	Cefazolin	2	16	0	2	8	0	2	8	0
	Cefotaxime	1	1	0	1	2	0	1	2	0
	Ceftazidime	2	2	0	1	2	0	2	2	0
	Ceftiofur	1	1	0	0.5	1	0	0.5	1	0
Penicillins	Ampicillin	512	>1024	60.9	16	1024	33.3	16	>1024	50
	Amoxicillin	>1024	>1024	56.5	8	>1024	26.7	16	>1024	44.7
	Amoxicillin-clavulanic acid	8/4	16/8	0	8/4	16/8	6.7	8/4	16/8	2.6
Phenicols	Chloramphenicol	16	512	43.5	8	32	13.3	8	512	31.6
	Florfenicol ^c)	4	8	34.8	4	16	26.7	4	16	31.6
Polymyxins	Colistin	1	1	0	1	2	0	1	2	0
Quinolones	Ciprofloxacin	<0.125	0.25	0	<0.125	32	13.3	0.125	0.25	5.3
	Enrofloxacin ^c)	0.25	0.5	0	<0.125	32	13.3	0.125	1	5.3
	Nalidixic acid	8	512	43.5	8	>1024	33.3	8	1024	38.6
Sulfonamides	Sulfamethoxazole-trimethoprim	4/76	>1024	43.5	1/19	>1024	20	2/38	>1024	34.2
Tetracyclines	Doxycycline	8	128	39.1	2	32	26.7	4	128	28.9
	Oxytetracycline	256	1024	73.9	8	1024	40	8	1024	60.5

a) MIC breakpoints according to CLSI guidelines. b) Percentage of resistant isolates. c) Because the MIC breakpoints for UTIs were not provided in the 2007 CLSI guidelines, the values for bovine respiratory pathogens were used [10].