Streptococcus spp. (Viridans group) and Ampicillin (Omnipen)
Concentration
(μg/ml)
100
90
80
70
60
50
40
30
20
10
Ampicillin (Omnipen)
8
0.25
Ampicillin (Omnipen)
100
0.78
1
2
MIC50
MIC90
Strain Number