Table 2.
Antibiotic resistance of L. lactis IBB109 and IBB417 strains.
| Antibiotic | Minimal inhibitory concentration (MIC)* | Break-point values for L. lactis strains according to EFSA | ||
|---|---|---|---|---|
| IBB109 | IBB417 | ATCC 19435 (L. lactis AbR-free control strain) | ||
| Gentamicin | 1 | 1–2 | 0.5–4 | 32 |
| Kanamycin | 8–16 | 8 | 2–8 | 64 |
| Streptomycin | 8 | 8–16 | 2–16 | 32 |
| Tetracycline | 0.5 | 0.25–0.5 | 0.5–2 | 4 |
| Erythromycin | 0.063 | 0.032–0.063 | 0.12–0.5 | 1 |
| Clindamycin | 0.032–0.063 | 0.032 | 0.25–0.5 | 1 |
| Chloramphenicol | 4 | 4 | 4–16 | 8 |
| Ampicillin | 0.25–0.5 | 0.5 | 0.5–1 | 2 |
| Vancomycin | 0.25 | 0.25 | 0.25–1 | 4 |
*
MIC values are given in μg ml−1.