TABLE 1.

Resistance phenotype and MICs of ciprofloxacin and nalidixic acid for Salmonella enterica serovar Typhi (n = 428), January to December 2005

Resistance phenotype(s)a	No. (%) of isolates	MIC (μg/ml)
		Ciprofloxacin	Nalidixic acid
Ampr Chlr Sxtr NAr Cipr	10 (2.33)	6.0-16.0	≥256
Ampr Chlr Sxtr NAr Ciprs	234 (54.67)	0.19-0.25	≥256
Ampr Chlr NAr Ciprs	1 (0.23)	0.19-0.25	≥256
Chlr Sxtr NAr Ciprs	5 (1.16)	0.19-0.25	≥256
Ampr Chlr Sxtr	3 (0.70)	NDb	ND
NAr Ciprs	138 (32.24)	0.19-0.25	≥256
Susceptible	37 (8.64)	0.012-0.016	2.0-3.0

^aAmp, ampicillin; Chl, chloramphenicol; Sxt, trimethoprim-sulfamethoxazole; NA, nalidixic acid; Cip, ciprofloxacin; r, resistant; rs, reduced susceptibility.

^bND, not determined.