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Luciferase activity of the fnbB-luxAB reporter plasmid in strains EN1252a(pFNBB6) and ISP794(pFNBB6) either unexposed or continuously exposed for 5 h to one-quarter the MIC of ciprofloxacin (A) and bacterial growth monitored by measuring the optical density at 540 nm (B). ∗, P < 0.05 for culture grown with ciprofloxacin compared to that without ciprofloxacin.
