Table 2.
Effect of some antibiotics on bacterial growth and biofilm formation.
| Antibiotic | Concentration Range (SubMIC *) (ng/mL) | Maximum Induction of Bacterial Growth (%) | Maximum Induction of Biofilm (%) |
|---|---|---|---|
| Gentamicin | 500.0–3.9 | 31.0 | 25.0 |
| Tetracycline | 170.0–1.3 | 31.0 | 46.0 |
| Amikacin | 500.0–3.9 | No effect | 56.0 |
| Norfloxacin | 12.0–0.09 | No effect | 50.0 |
| Nitrofurantoin | 12.0–0.09 | No effect | −15.0 ** |
| Levofloxacin | 12.0–0.09 | No effect | −15.0 ** |
| Ciprofloxacin | 1.02–0.09 | No effect | −35.0 ** |
* SubMIC, Subminimal inhibitory concentration. ** Negative values mean biofilm inhibition effect.