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| Bacterial population (CFU mL–1) | 1st EC50 (μg mL–1) | 2nd EC50 (μg mL–1) |
| 2.5 × 107 | 31 ± 1 | 61 ± 2 |
| 5.4 × 107 | 31.1 ± 0.8 | 72 ± 1 |
| 7.8 × 107 | 30.5 ± 0.8 | 78 ± 1 |
| 1.0 × 108 | 33 ± 1 | 94 ± 2 |
| 1.4 × 108 | 31.3 ± 0.5 | 101 ± 2 |
