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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococcus pyogenes (erythromycin-susceptible) 0.2 0.2 0.1 － 0.2 Quinupristin/Dalfopristin (Synercid) 35
Streptococcus pyogenes (erythromycin-susceptible) 0.5 1 0.25 － 1 Quinupristin/Dalfopristin (Synercid) 502
Streptococcus pyogenes (erythromycin-susceptible) ≤- ≤0.12 ? － ? Quinupristin/Dalfopristin (Synercid) 1112