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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococcus pyogenes 0.015 0.03 0.015 － 0.03 Ampicillin (Omnipen) 1491
Streptococcus pyogenes 0.015 0.03 0.015 － 0.12 Ampicillin (Omnipen) 443
Streptococcus pyogenes 0.015 0.03 0.015 － 0.12 Ampicillin (Omnipen) 130
Streptococcus pyogenes - - 0.007 － ? Ampicillin (Omnipen) 252