Antimicrobial susceptibilities and minimum inhibitory concentrations (MIC) of 263 <i>S. typhi</i> isolate.

MIC50/90, concentration at which 50% and 90% of the organisms respectively are inhibited. MDR is defined as resistance to chloramphenicol, ampicillin and trimethoprim-sulfamethoxazole. CLSI MIC breakpoints are as follows: for chloramphenicol, ampicillin and nalidixic acid resistance ≥32 µg/mL; ofloxacin and gatifloxacin ≤2 µg/mL susceptible and ≥8 µg/mL resistant; ciprofloxacin ≤1 µg/mL susceptible and ≥4 µg/mL resistant; ceftriaxone ≤8 µg/mL susceptible and ≥64 µg/mL resistant; there are none for azithromycin.