TABLE 2.
Antibiotic susceptibility of P. putida B6-2 and its derivatives
| Antibiotic (μg/piece)a | Inhibition halo (cm) |
|||
|---|---|---|---|---|
| B6-2 | B6-2ΔsrpABC | B6-2ΔttgABC | B6-2ΔsrpSΔttgABC | |
| Ampicillin (10) | Nob | No | 1.9 ± 0.1 | No |
| Cefepime (30) | 2.6 ± 0.2 | 2.6 ± 0.2 | 3.6 ± 0.1 | 3.0 ± 0.2 |
| Cefotaxime (30) | 1.9 ± 0.1 | 1.8 ± 0.1 | 3.4 ± 0.1 | 2.5 ± 0.1 |
| Cefoxitin (30) | No | No | 2.8 ± 0.2 | No |
| Ceftazidime (30) | 2.5 ± 0.0 | 2.3 ± 0.2 | 2.9 ± 0.2 | 2.7 ± 0.1 |
| Nalidixic acid (30) | 1.8 ± 0.3 | 1.8 ± 0.2 | 3.1 ± 0.2 | 2.4 ± 0.1 |
| Novobiocin (30) | No | No | 1.5 ± 0.0 | 0.8 ± 0.1 |
| Tetracycline (30) | 1.3 ± 0.3 | 1.3 ± 0.1 | 2.3 ± 0.1 | 1.9 ± 0.0 |
| Chloramphenicol (30) | No | No | 1.1 ± 0.1 | 0.9 ± 0.1 |
| Erythromycin (15) | No | No | 1.5 ± 0.1 | 2.0 ± 0.0 |
| Gentamicin (10) | 1.5 ± 0.1 | 1.6 ± 0.0 | 2.2 ± 0.1 | 2.3 ± 0.1 |
| Meropenem (10) | 0.8 ± 0.1 | 1.0 ± 0.2 | 2.5 ± 0.2 | 2.6 ± 0.2 |
| Spectinomycin (100) | No | No | 1.5 ± 0.2 | 2.5 ± 0.1 |
| Streptomycin (10) | No | No | 2.0 ± 0.1 | 2.1 ± 0.0 |
a
Fourteen of the 20 antibiotics tested in this assay are shown. There were no differences found in susceptibility to rifampin, fosfomycin, teicoplanin, nystatin, lincomycin, or polymyxin B.
b
No, no bacteriostatic ring.