Table 2.

Minimal Inhibitory Concentration (MIC) Breakpoints for Enterobacteriaceae. Source: (CLSI [25]).

Test/Reportgroup	Antimicrobialagent	DiskContent (µg)	Zone Diameter Breakpoints, Nearest Whole mm			MIC Interpretive Standard (µg/mL)
			S	I	R	S	I	R
A	Ampicillin	10	≥17	14–16	≤13	≤6	16	≥32
A	Gentamycin	10	≥15	13–14	≤12	≤4	8	≥16
B	Amikacin	30	≥17	15–16	≤14	≤16	32	≥64
O	Streptomycin	10	≥15	12–14	≤11	-	-	-
O	Kanamycin	30	≥18	14–17	≤13	≤16	32	≥64
C	Tetracycline	30	≥15	12–14	≤11	≤4	8	≥16
B	Ciproflaxacin	5	≥21	16–20	≤15	≤1	2	≥4
U	Norflaxacin	10	≥17	13–16	≤12	≤4	8	≥16
B	Trimethoprime-sulfamethoxazole	1.25/23.75	≥16	11–15	≤10	≤2/38	-	≥4/76
C	Chloramfenicol	30	≥18	13–17	≤12	≤8	16	≥32