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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Haemophilus influenzae 0.25 1 ≤0.06 － 4 Ampicillin (Omnipen) 1111
Haemophilus influenzae >0.5 >4 ≤0.25 － >4 Ampicillin (Omnipen) 499
Haemophilus influenzae >0.5 >4 ≤0.5 － >4 Ampicillin (Omnipen) 412
Haemophilus influenzae >0.5 >32 ≤0.5 － >32 Ampicillin (Omnipen) 42
Haemophilus influenzae 0.5 128 0.125 － 128 Ampicillin (Omnipen) 248
Haemophilus influenzae >1 >32 0.12 － >32 Ampicillin (Omnipen) 125
Haemophilus influenzae 4 64 0.25 － 128 Ampicillin (Omnipen) 1491
Haemophilus influenzae >16 >16 0.12 － >16 Ampicillin (Omnipen) 1279
Haemophilus influenzae - - 0.07 － ? Ampicillin (Omnipen) 252