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Antimicrobial MIC results of 37 C. difficile isolates.
| Antimicrobial agents | MIC50 (µg/ml) | MIC90 (µg/ml) | Resistance breakpoint (µg/ml) | MIC (µg/ml) range | Number (%) of resistance |
|---|---|---|---|---|---|
| Ciprofloxacin∗ | 5.3 | 9.6 | 8 | 3.0–16.0 | 29 (78.4) |
| Erythromycin | 0.42 | 0.75 | 8 | 0.25–2.0 | 11 (29.7) |
| Vancomycin | 0.89 | 1.60 | 32 | 1.0–4.0 | Null |
| Metronidazole | 0.09 | 0.16 | 32 | 0.023–0.25 | Null |
∗A total of 40.5% of isolates were positive for both mutated GyrA and GyrB genes.
