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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococcus pneumonia (penicillin-susceptible) <0.015 <0.015 <0.015 － 0.12 Ampicillin (Omnipen) 84
Streptococcus pneumonia (penicillin-susceptible) ≤0.015 ≤0.015 ≤0.015 － 0.12 Ampicillin (Omnipen) 114
Streptococcus pneumonia (penicillin-susceptible) 0.016 0.031 0.008 － 0.031 Ampicillin (Omnipen) 121
Streptococcus pneumonia (penicillin-susceptible) ≤0.06 ≤0.06 ≤0.06 － 0.12 Ampicillin (Omnipen) 462
Streptococcus pneumonia (penicillin-susceptible) ≤0.25 ≤0.25 ≤0.25 － <=0.25 Ampicillin (Omnipen) 186