FIG 7.

The ΔkatA mutant exhibits a biofilm biomass defect on silicone catheters. (A) Representative images of crystal violet-stained 15-mm silicone Foley catheter segments after 20 h of incubation with the WT, the ΔkatA mutant, the ΔkatA mutant plus bovine catalase, or plain LB (blank). (B) Biomasses of 20-h WT (gray), ΔkatA mutant (white), or ΔkatA mutant plus bovine catalase (light gray) catheter biofilms as assessed by crystal violet staining at an OD₅₇₀. Error bars represent means and SDs from at least 3 independent experiments with at least 3 technical replicates each. **, P < 0.01; ***, P < 0.001 (by one-way ANOVA with Tukey’s test for multiple comparisons).