FIG. 3.

Quantitative and qualitative biofilm assays. (A) Quantitative analysis of biofilm accretion by P. gingivalis strains and chimeras. Chimeric strains 2, 4, and 9 (dark bars) were compared to strain 33277TcEm for statistical analysis by t test. All other chimeras (light bars) were compared to W83TcEm. Results represent three independent experiments, each done in triplicate (n = 9). Symbols * and # represent P values of <0.05. (B) Fluorescent microscopy images of 24-h biofilm formation by nonchimeric strain 33277TcEm and chimera 4. Magnification, ×40.