TABLE 2.

Fluoroquinolone MICs for S. marcescens strains^a

Strainb	MIC (μg ml−1)c
	CIP	NOR	OFX
UOC-67	0.032	0.125	0.5
T-861	4	32	4
UOC-67WL	32	64	32
UOC-67WLN	8	32	16
UOC-67WLO	4	16	8

^aResults represent values obtained from three independent experiments.

^bUOC-67 is the wild-type strain of S. marcescens, T-861 is the clinical isolate, and UOC-67WL, UOC-67WLN, and UOC-67WLO are the mutant strains generated by serial passaging of UOC-67 in the media supplemented by ciprofloxacin, norfloxacin, and ofloxacin, respectively.

^cCIP, ciprofloxacin; NOR, norfloxacin; OFX, ofloxacin.