Table 3.
Antibiotic susceptibility profilesa
| Strain and stimulus | Antibiotic susceptibility (inhibition zone diam [mm]) |
||||
|---|---|---|---|---|---|
| Erythromycin | Tetracycline | Telithromycin | Ciprofloxacin | Chloramphenicol | |
| Jc194 | |||||
| None | 10 | 25 | 13 | 34 | 24 |
| SAL | 0 | 18 | 9 | 28 | 21 |
| DEC | 0 | 23 | 11 | 32 | 24 |
| PQ | 0 | 18 | 8 | 27 | 17 |
| TET | 0 | 11 | 8 | 27 | 11 |
| EcDC64 | |||||
| None | 0 | 0 | 9 | 32 | 25 |
| SAL | 0 | 0 | 0 | 28 | 21 |
| DEC | 0 | 0 | 8 | 32 | 25 |
| PQ | 0 | 0 | 0 | 27 | 18 |
| TET | 0 | 0 | 0 | 32 | 24 |
| EcΔrobA | |||||
| None | 10 | 26 | 14 | 38 | 24 |
| SAL | 0 | 21 | 11 | 28 | 22 |
| DEC | 10 | 26 | 13 | 46 | 33 |
| PQ | 0 | 18 | 11 | 27 | 17 |
| TET | 0 | 14 | 10 | 26 | 16 |
| EcΔsoxS | |||||
| None | 9 | 23 | 14 | 34 | 24 |
| SAL | 0 | 18 | 11 | 29 | 25 |
| DEC | 8 | 22 | 12 | 32 | 25 |
| PQb | 10 | 31 | 17 | 42 | 28 |
| TET | 0 | 16 | 11 | 29 | 15 |
| EcΔramA | |||||
| None | 10 | 25 | 15 | 37 | 25 |
| SAL | 0 | 19 | 12 | 28 | 23 |
| DEC | 9 | 22 | 12 | 31 | 27 |
| PQ | 0 | 18 | 12 | 32 | 18 |
| TET | 0 | 24 | 17 | 40 | 26 |
a
Antibiotic susceptibility profiles, expressed as the diameters of the inhibition zones, were determined by the standard disk diffusion method for the bacterial isolates in the presence of various stimuli: 10 mM sodium salicylate (SAL), 10 mM sodium decanoate (DEC), 0.1 mM paraquat (PQ), or 4 μg of tetracycline/ml (TET). A value of “0” means that an inhibition zone around the disk (6 mm) was not detected.
b
The concentration of paraquat used was 50 μM.