TABLE 1.

Bacterial strains used in this study and MICs of ciprofloxacin and levofloxacin^a

Strain	MIC (mg/liter) of ciprofloxacin	MIC (mg/liter) of levofloxacin
E. coli ATCC 25922	0.008	0.03
E. coli 523 (NARb)	0.125	0.25
K. pneumoniae 595	0.008	0.03
P. mirabilis 414	0.03	0.06
P. aeruginosa 568	0.5	2
S. aureus 83	0.125	0.125
S. saprophyticus Ho94	0.25	0.25
E. faecalis 60	1	1

^aMICs were measured in Mueller-Hinton broth.

^bNAR, nalidixic acid resistant.