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In vitro synergistic activity between ofloxacin and ansamycins against Mycobacterium leprae
A M Dhople1, M A Ibanez, G D Gardner
1Florida Institute of Technology, Melbourne.
Abstract:
The antimicrobial effects of ofloxacin, alone and in combination with either rifampicin or rifabutin, were evaluated against M. leprae, using in vitro cell-free culture system. The minimum inhibitory concentration (MIC) of ofloxacin against M. leprae was 1.5 micrograms/ml, while MICs of rifampicin and rifabutin were 0.4 and 0.2 microgram/ml, respectively. Combination of 0.375 microgram/ml ofloxacin and 0.05 microgram/ml of rifabutin exhibited synergistic bactericidal activity while the effect of combination of 0.75 microgram/ml ofloxacin and 0.2 microgram/ml rifampicin was additive bactericidal. Thus, combination of ofloxacin and rifabutin deserves further attention in multi-drug therapy of leprosy.