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Activities of clarithromycin alone and in combination with rifampicin, gatifloxacin or linezolid were evaluated against Mycobacterium kansasii in a murine infection model. Clarithromycin was the most active single agent. Rifampicin and gatifloxacin had similar activities, but were less active than clarithromycin. Clarithromycin in combination with rifampicin was the most active combination therapy.