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Time-kill experiments showing the viability of S. aureus untreated (Ctrl) or in the presence of increasing concentrations of the 2.6 kDa chitosan, (A) for strain MRSA 1158c, and (B) for the biofilm hyperproducer strain 2117. The CFU detection limit is 10 CFU/ml. Data are presented as means with standard deviations from three independent experiments.
