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Persister levels of the parent S. aureus strain USA500 in drug exposure assays. Stationary-phase cultures of the wild-type USA500 were exposed to the different drugs, including levofloxacin (12.5 μg/ml), vancomycin (25 μg/ml), rifampicin (1.5 μg/ml), and gentamicin (100 μg/ml). The vertical axis represents CFU values in log scale, and the horizontal axis represents the time of exposure. The error bars indicate standard deviations.
