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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococcus pyogenes (constitutively erm(B)) >64 >64 >64 － ? Azithromycin (Zithromax, Sumamed, Zitrocin) 502
Streptococcus pyogenes (constitutively erm(B)) >128 >128 >128 － ? Azithromycin (Zithromax, Sumamed, Zitrocin) 1113
Streptococcus pyogenes (constitutively erm(B)) - - >128 － ? Azithromycin (Zithromax, Sumamed, Zitrocin) 15