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