|
Strain
|
Penicillin MIC (mg/L)
|
Oxacillin zone diameter BI
|
Erythromycin zone diameter BI
|
Co-trimoxazole zone diameter BI
|
|---|
|
1
|
<0.016
|
S
|
S
|
I
|
|
2
|
<0.016
|
S
|
S
|
S
|
|
3
|
0.016
|
S
|
S
|
R
|
|
4
|
0.016
|
S
|
S
|
I
|
|
5
|
0.016
|
S
|
S
|
S
|
|
6
|
0.016
|
S
|
S
|
I
|
|
7
|
0.016
|
S
|
S
|
I
|
|
8
|
0.023
|
S
|
S
|
S
|
|
9
|
0.047
|
S
|
S
|
R
|
|
10
|
0.047
|
NS
|
S
|
I
|
|
11
|
0.125
|
NS
|
S
|
R
|
|
12
|
0.25
|
NS
|
S
|
R
|
|
13
|
0.75
|
NS
|
S
|
R
|
|
14
|
0.75
|
NS
|
S
|
R
|
|
15
|
0.75
|
NS
|
S
|
R
|
|
16
|
ND
|
NS
|
S
|
I
|
- Minimal inhibitory concentration (MIC) and zone diameter breakpoint interpretation (BI) of cultured pneumococcal strains, as measured by E-test (penicillin) and disc diffusion method (oxacillin, erythromycin, co-trimoxazole), respectively. S: susceptible; NS: non-susceptible; R: resistant. In pneumonia, when a dose of 1.2 g (2 million IU) × 4 is used, isolates with MIC ≤0.5 mg/L should be regarded as susceptible to benzyl penicillin; with a dose of 2.4 g × 4 or 1.3 g × 6, isolates with MIC ≤1 mg/L should be regarded as susceptible; and with a dose of 2.4 g × 6, isolates with MIC ≤2 mg/L should be regarded as susceptible [8]. Not done: ND.
