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Cell survival fraction of S. aureus biofilm (A) and P. aeruginosa biofilm (B) after being incubated with various formulas of HCT hydrogel for 1 h and then subjected to 20 J·cm−2 of the red light illumination. After PDI, biofilm cell was maintained in HCT hydrogel for 0, 30 min, 1 h and 2 h and then plate count. Each value is the mean from three independent experiments ± standard deviation. * p < 0.05. x means no biofilm colonies were counted in this study.
