TABLE 1.
Antimicrobial susceptibility of 74 Campylobacter jejuni isolates as determined by the agar dilution test
| Antibiotic | Range of concn (μg/ml) tested | MIC (μg/ml)
|
Resistance breakpoint (μg/ml) | No. (%) of resistant isolates | ||
|---|---|---|---|---|---|---|
| Range | 50% | 90% | ||||
| Ceftiofur | 0.5-64 | >64 | >64 | >64 | ≥8a | 74 (100) |
| Enrofloxacin | 0.13-64 | <0.13 | <0.13 | <0.13 | ≥4 | 0 |
| Florfenicol | 0.5-64 | 1-2 | 1 | 2 | ≥32 | 0 |
| Oxytetracycline | 0.25-128 | 16-128 | 64 | 64 | ≥16 | 74 (100) |
| Penicillin | 0.13-64 | 8-64 | 16 | 16 | ≥16a | 40 (54) |
| Tilmicosin | 0.13-64 | 1-4 | 1 | 2 | ≥32 | 0 |
| Tulatromycin | 0.13-64 | 0.25-0.5 | 0.25 | 0.5 | ≥32 | 0 |
| Tylosin | 0.5-64 | 8-64 | 8 | 8 | ≥32 | 2 (2.7) |