Abstract
The in vitro activities of pyrimethamine and dapsone alone and in combination were evaluated against 23 clinical isolates of Mycobacterium avium complex. The broth dilution MICs of dapsone and pyrimethamine alone ranged from 16 to > 64 micrograms/ml. Pyrimethamine in combination with a fixed concentration of dapsone at 0.5 microgram/ml showed enhanced activity, with an MIC range of 0.5 to 16 micrograms/ml.
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