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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Haemophilus influenzae (ampicillin-susceptible) 0.25 1 0.12 － 1 Ampicillin (Omnipen) 130
Haemophilus influenzae (ampicillin-susceptible) 0.25 1 0.12 － 1 Ampicillin (Omnipen) 443
Haemophilus influenzae (ampicillin-susceptible) 0.3 0.6 ? － ? Ampicillin (Omnipen) 58
Haemophilus influenzae (ampicillin-susceptible) 0.5 1 0.25 － 2 Ampicillin (Omnipen) 115