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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococcus spp. (Viridans group) 0.25 8 ≤0.06 － >8 Ampicillin (Omnipen) 462
Streptococcus spp. (Viridans group) 0.78 100 0.1 － 100 Ampicillin (Omnipen) 326