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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Clostridium difficile (1983–2004 + USA) 0.0075 0.03 0.0019 － >16 Rifalazil (ABI-1648, KRM-1648) 1079