TABLE 2.

Distribution of P. aeruginosa strains by susceptibility to ciprofloxacin and imipenem and number of mutations in topoisomerase genes

MIC of ciprofloxacin (μg/ml)	No. of strains with:
	One mutationa		Two mutationsb
	Imisc	Imird	Imis	Imir
2	1	2	0	0
4	3	2	0	0
8	2	0	0	1
16	0	3	0	1
32	0	4	1	2
64	1	2	1	3
128	0	0	1	0

^aStrains with a single mutation in gyrA or gyrB. 

^bStrains with one mutation in gyrA and one mutation in parC. 

^cImi^s, susceptible to imipenem at MIC range of 0.5 to 4 μg/ml. 

^dImi^r, resistant to imipenem at MIC range of 8 to 64 μg/ml.