TABLE 3.

MICs of ciprofloxacin for isogenic E. coli strains in MH broth at different pH values^a

Strain	MIC (μg/ml) in MH broth at pH:
	7		6		5
	O2	nO2	O2	nO2	O2	nO2
ATCC 25922	0.004	0.008	0.03	0.06	0.125	0.125
EC01	0.008	0.06	0.125	0.125	0.5	0.25
EC02	0.125	0.25	1	1	4	4
EC03	0.25	1	2	4	8	8
EC04	0.5	1	4	4	16	16
EC05	1	4	8	8	64	32
EC06	0.125	0.25	1	1	4	4
EC07	0.25	1	4	4	16	16
EC08	2	4	16	16	64	128
EC09	4	16	32	64	256	128

^aIntermediate and resistant MIC values according to the CLSI guideline are shown in bold. O₂, aerobic incubation; nO₂, anaerobic incubation.