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Time-kill curves for vancomycin-resistant E. faecium (strain 3) without a drug (⧫) or with ampicillin-sulbactam (32 μg/ml) (▴), doxycycline (2 μg/ml) (●), quinupristin-dalfopristin (0.25 μg/ml) (✠), ampicillin-sulbactam (32 μg/ml) plus quinupristin-dalfopristin (0.25 μg/ml) (|), and doxycycline (2.0 μg/ml) plus quinupristin-dalfopristin (0.25 μg/ml) (◊).
