Table 1. Dilution ranges and breakpoints for antimicrobial susceptibility testing.
| Antimicrobial | Range | Breakpoint* |
|---|---|---|
| Ampicillin | 0.5–16 | ≥16 |
| Chloramphenicol | 2–32 | ≥32 |
| Daptomycin | 0.125–4 | ≥8 |
| Erythromycin | 0.25–8 | ≥8 |
| Flavomycin | 1–32 | ≥32 |
| Gentamicin | 32–1024 | ≥512 |
| Kanamycin | 128–1024 | ≥1024 |
| Lincomycin | 1–32 | ≥8 |
| Linezolid | 0.5–8 | ≥8 |
| Penicillin | 0.5–16 | ≥16 |
| Streptomycin | 256–1024 | ≥1024 |
| Teicoplanin | 0.125–4 | 2 |
| Tetracycline | 2–16 | ≥16 |
| Tigecycline | 0.016–0.5 | ≥0.5 |
| Vancomycin | 0.25–32 | ≥32 |
| Virginiamycin | 1–32 | >8 |
* CLSI breakpoints were adopted for ampicillin, daptomycin, erythromycin, linezolid, penicillin and vancomycin. NARMS breakpoints were used for chloramphenicol, flavomycin, gentamicin, kanamycin, lincomycin, streptomycin, tetracycline, tigecycline with EUCAST breakpoints used for teicoplanin and virginiamycin.