Table 2. Antimicrobial susceptibilities of the different clonal groups identified using pulsed-field gel electrophoresis.
| Antimicrobial agent | Clonal group A (n = 55) |
Clonal group B (n = 126) |
||||||
|---|---|---|---|---|---|---|---|---|
| MIC50 (mg/L) | MIC90 (mg/L) | % resistant | Range | MIC50 (mg/L) | MIC90 (mg/L) | % resistant | Range | |
| Oxacillin | 16 | 32 | 100 | 4–64 | 16 | 32 | 100 | 4–64 |
| Cefazolin | 32 | 32 | 75 | 4–32 | 16 | 32 | 31 | 2–32 |
| Ciprofloxacin | 32 | ≥32 | 86 | 0.25–≥32 | 0.25 | 0.25 | 0 | 0.25–0.5 |
| Clindamycin | <0.25 | ≥8 | 11 | <0.25–≥8 | <0.25 | <0.25 | 1.6 | <0.25–≥8 |
| Erythromycin | >8 | ≥8 | 87 | <0.25–≥8 | <0.25 | ≥8 | 40 | <0.25–≥8 |
| Gentamicin | >16 | ≥16 | 64 | <0.5–≥16 | <0.5 | <0.5 | 0 | <0.5 |
| Rifampin | <0.25 | <0.25 | 3.6 | <0.25–≥4 | <0.25 | <0.25 | 0 | <0.25 |
| Tetracycline | 16 | ≥16 | 55 | <2–≥16 | <2 | <2 | 0 | <2 |
| Trimethoprim/sulfamethoxazole | <0.25 | 0.5 | 5.5 | <0.25 | <0.25 | <0.25 | 0 | <0.25 |
| Vancomycin | 1.0 | 1.0 | 0 | 1.0 | 1.0 | 1.0 | 0 | 0.5-1.0 |
| Linezolid | 4.0 | 4.0 | 0 | 4.0 | 2.0 | 4.0 | 0 | 1.0-4.0 |
| Mupirocin | ≥128 | ≥128 | 58 | ≥128 | ≥128 | ≥128 | 55.6 | <0.25–≥128 |
| Fusidic acid | ≥8 | ≥8 | 100 | ≥8.0 | 0.12 | 0.25 | 0 | 0.12–0.25 |