FIG. 4.

Sensitivity of P. gingivalis strains to oxidative stress. Survival studies were performed over a period ranging from 30 min to 180 min under three experimental conditions: anaerobic conditions (control) (A), atmospheric oxygen (B), and atmospheric oxygen and peroxide (0.5 mM) (C). Survival rates are expressed as log₁₀ ratios of the number of surviving cells in the presence of oxidative stress to the number of cells grown under anaerobic conditions. P values of <0.05 were considered to indicate statistically significant differences (shown by *).