title: Activity of ciprofloxacin against Mycobacteria in vitro: comparison of BACTEC and macrobroth dilution methods.
abstract: Various clinical isolates of mycobacteria were tested for susceptibility to ciprofloxacin by a standard macrobroth dilution test and the radiometric BACTEC method. Agreement between the two test systems was species dependent: Mycobacterium tuberculosis (80%), M. kansasii with M. scrofulaceum (30%), M. avium-intracellulare (20%), and 0% for the rapidly growing mycobacteria. Most mycobacterial strains other than M. tuberculosis were susceptible to the breakpoint ciprofloxacin concentration of 2 mg/l as determined by BACTEC MICs, whereas none were susceptible by macrobroth testing. Seven of nine M. tuberculosis isolates were susceptible by either method. Ciprofloxacin merits further study as a potential antimycobacterial agent.
mesh_terms: D002939:Ciprofloxacin / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D009161:Mycobacterium / Q000187:drug effects*; D009162:Mycobacterium avium / Q000187:drug effects; D009169:Mycobacterium tuberculosis / Q000187:drug effects; D009170:Nontuberculous Mycobacteria / Q000187:drug effects
chemical_list: D002939:Ciprofloxacin