TABLE 2.

MIC frequencies and NCCLS interpretive criteria of gatifloxacin as determined by the reference MIC method and the VITEK 2 instrument

Gatifloxacin VITEK 2 MICs	No. of isolates with reference MIC
	0.25 μg/ml	Sus- ceptible (1 μg/ml)	Inter- mediate (2 μg/ml)	Resistant		Total
				4 μg/ml	8 μg/ml
0.5 μg/ml	2	2		1		5
Susceptible (1 μg/ml)		2	5			7
Intermediate (2 μg/ml)			1	7		8
Resistant (4 μg/ml)				24	9	33
8 μg/ml				3	16	19
Total	2	4	6	35	25	72