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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococcus pyogenes (erythromycin A-susceptible) 0.12 0.25 0.001 － 0.5 Azithromycin (Zithromax, Sumamed, Zitrocin) 950
Streptococcus pyogenes (erythromycin A-susceptible) - - 0.015 － 0.25 Azithromycin (Zithromax, Sumamed, Zitrocin) 52