Fig 1. Antibiofilm activity of the different forms of chitosan against MRSA 1158c and the biofilm hyperproducer strain 2117.

(A) CHOS, (B) 1.3 kDa, (C) 2.6 kDa, and (D) 4.0 kDa chitosan. Bars represent the means and vertical lines the standard deviation (SD). Data were obtained from three independent experiments. Significant differences in comparison to the untreated control (0 mg/ml) are shown by asterisks. Statistical analysis was performed using Kruskal-Wallis test (non-parametric one way ANOVA) with Dunn’s multiple comparison test: ns, non significant; *, P<0.05.