Table 1 Susceptibility and minimum inhibitory concentrations (MICs) of 140 S. pneumoniae isolates to erythromycin and tetracycline
Age group | No. | Antibiotics | Susceptible | Intermediate | Resistant | MIC50 (μg/mL) | MIC90 (μg/mL) | MIC range (μg/mL) |
|---|---|---|---|---|---|---|---|---|
0 to 2 years | 57 | erythromycin | 3 (5.3%) | 0 (0%) | 54 (94.7%) | >256 | >256 | 0.125- > 256 |
tetracycline | 9 (15.8%) | 5 (8.8%) | 43 (75.4%) | 12 | 16 | 0.064-16 | ||
2 to 5 years | 83 | erythromycin | 1 (1.2%) | 1 (1.2%) | 81 (97.6%) | >256 | >256 | 0.125- > 256 |
tetracycline | 6 (7.3%) | 9 (10.8%) | 68 (81.9%) | 12 | 16 | 0.094-32 | ||
0 to 5 years | 140 | erythromycin | 4 (2.9%) | 1 (0.7%) | 135 (96.4%) | >256 | >256 | 0.125- > 256 |
| Â | Â | tetracycline | 15 (10.7%) | 14 (10.0%) | 111 (79.3%) | 12 | 16 | 0.064-32 |