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Breakpoints used for determination of the antimicrobial resistance of C. jejuni and C. coli.
| Antibiotic (disk concentration) | Zone diameter (mm) | |
|---|---|---|
| S ≥ | R < | |
| Tetracycline (30 μg) | 30 | 30 |
| Ciprofloxacin (5 μg) | 50 | 26 |
| Erythromycin (15 μg), C. coli | 20 | 20 |
| Erythromycin (15 μg), C. jejuni | 24 | 24 |
| Ampicillin (10 μg) | 13* | 7* |
| Chloramphenicol (30 μg) | 18* | 18* |
| Kanamycin (30 μg) | 15* | 7* |
| Streptomycin (25 μg) | 22* | 13* |
Epidemiological cut-off values (Ecoff).
