Table 1.
Dilution ranges and breakpoints used for antimicrobial susceptibility testing of Enterococcus isolates of faecal origin.
| Antimicrobial Agent | Range | Breakpoints for Resistance |
|---|---|---|
| Chloramphenicol | 2–32 | ≥32 a |
| Ciprofloxacin | 0.12–4 | ≥4 a |
| Daptomycin | 0.25–16 | ≥8 a |
| Erythromycin | 0.25–8 | ≥8 a |
| Gentamicin | 128–1024 | ≥512 b |
| Kanamycin | 128–1024 | ≥1024 b |
| Lincomycin | 1–8 | ≥8 b |
| Linezolid | 0.5–8 | ≥8 a |
| Nitrofurantoin | 2–64 | >64 a |
| Penicillin | 0.25–16 | ≥16 a |
| Streptomycin | 512–2048 | ≥1024 b |
| Quinupristin/Dalfopristin | 0.5–32 | ≥4 a |
| Tetracycline | 1–32 | ≥16 a |
| Tigecycline | 0.015–0.5 c | ≥0.5 b |
| Tylosine tartarte | 0.25–32 | ≥32 b |
| Vancomycin | 0.25–32 | ≥32 a |
a Breakpoint established by the Clinical and Laboratory Standards Institute; b breakpoint established by the National Antimicrobial Resistance Monitoring System; c only a breakpoint for susceptibility has been established [28].