Staphylococci (coagulase-negative) and Ampicillin (Omnipen)
Concentration
(μg/ml)
16
14.4
12.8
11.2
9.6
8
6.4
4.8
3.2
1.6
Ampicillin (Omnipen)
8
8
Ampicillin (Omnipen)
16
16
1
2
MIC50
MIC90
Strain Number