FIG 2.

(A) Viable microorganisms. Mean counts of S. mutans (black bar) and S. sanguinis (gray bar) expressed as CFU per milliliter were determined in each colonization sequence. Bars represent mean values of two independent experiments in triplicate (n = 6). Error bars show the standard deviation. Different letters represent significant differences across all colonization sequences (P < 0.05). These data are adapted from reference 22 with permission of the publisher (Karger Publishers, Basel, Switzerland [copyright 2018]). (B) H₂O₂ concentration. Production of H₂O₂ (μM) in each biofilm condition as described in Materials and Methods. Bars show mean values of two independent experiments in triplicate (n = 6). Error bars show the standard deviation. Different letters (a to d) represent significant differences across all colonization sequences (P < 0.05).