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Microorganism MIC50
(μg/ml)
MIC90
(μg/ml)
Range
(μg/ml)
Antimicrobial Reference
Enterobacteriaceae >16 >16 ≤1 - >16 Ampicillin (Omnipen) 158
Enterobacteriaceae >32 >32 ≤0.5 - >32 Ampicillin (Omnipen) 42
Enterobacteriaceae >32 >32 ? - ? Ampicillin (Omnipen) 36
Enterobacteriaceae - - 0.25 - 128 Ampicillin (Omnipen) 401