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In vitro antimicrobial activity of meropenem (A), Pa53 (B), and combinations of both (C) versus biofilm-embedded Pa_AR1 after 24-hour incubation. Histogram represents the mean of colony-forming units (CFU) number ± standard deviations of Pa_AR1 biofilm treated/untreated with meropenem (A), phage (B), and phage/meropenem (C), obtained in 3 independent experiments. The detection limit is 50 CFU/mL (horizontal dotted line). PFU, plaque-forming units.
