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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Staphylococcus aureus 0.2 1.56 0.1 － 25 Ampicillin (Omnipen) 785
Staphylococcus aureus >12.5 >200 0.05 － >200 Ampicillin (Omnipen) 326
Staphylococcus aureus >16 >16 ≤0.12 － >16 Ampicillin (Omnipen) 123
Staphylococcus aureus - - 0.06 － ? Ampicillin (Omnipen) 733
Staphylococcus aureus - - 0.1 － ? Ampicillin (Omnipen) 687
Staphylococcus aureus - - 1.25 － ? Ampicillin (Omnipen) 255
Staphylococcus aureus - - 1.56 － ? Ampicillin (Omnipen) 320
Staphylococcus aureus - - 2 － ? Ampicillin (Omnipen) 202
Staphylococcus aureus - - 2 － ? Ampicillin (Omnipen) 1286
Staphylococcus aureus - - 3.12 － ? Ampicillin (Omnipen) 1584
Staphylococcus aureus - - 6 － ? Ampicillin (Omnipen) 1132
Staphylococcus aureus - - 20 － ? Ampicillin (Omnipen) 1091
Staphylococcus aureus - - >128 － ? Ampicillin (Omnipen) 1002
Staphylococcus aureus - - 250 － ? Ampicillin (Omnipen) 1367
Staphylococcus aureus - - 250 － ? Ampicillin (Omnipen) 715
Staphylococcus aureus - - 250 － ? Ampicillin (Omnipen) 714