Fig 6.

The Yersinia pestis ΔluxS strain is more sensitive to hydrogen peroxide killing. Strains R88 and YP21 (ΔluxS mutant) were grown in BHI broth and exposed to various concentrations of hydrogen peroxide for 1 h. The reactions were quenched, and colony counts were performed. (A) Cells grown at 37°C with supplemented calcium. (B) Cells grown at 30°C with supplemented calcium. (C) Cells grown at 30°C. Data represent the means ± standard deviations of biological triplicates per peroxide concentration tested.