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Reduction in number of CFU/biofilm after treatment of B. cenocepacia biofilms with ciprofloxacin (32 μg/ml) (gray bars) or tobramycin (1,024 μg/ml) (black bars). Data are expressed as log reduction in CFU/biofilm (compared to the untreated biofilm). For the WT and all mutant biofilms investigated, the treated biofilms always contained significantly fewer CFU than the corresponding untreated control (P < 0.05). *, significantly more reduction than observed for the WT strain (P < 0.05).
