Fig. 1. Viable total bacteria or E. coli O157:H7 cells in biofilms treated with sterile water.
a Viable total bacteria in mixed biofilms formed by floor drain samples. b Viable E. coli O157:H7 cells in mixed biofilms or single-strain biofilm. Viable total bacteria and E. coli O157:H7 cells in sterile water-treated biofilms were harvested and quantified on TSA and O157 Chromagar plates, respectively. Data are shown as log10 CFU/chip. Error bars represent mean ± standard error of the mean. Statistical analysis was performed using ANOVA followed by post Turkey’s multiple comparisons test. P-values lower than 0.05 were considered statistically significant. Values labeled with the same letter are not statistically different.