FIG. 7.

Survival of ugd, mgtC, and ugd mgtC mutant Y. pestis strains in macrophages as determined by a viable count assay. J774A.1 macrophages were infected (MOI, 5) with KIM6+, KIM6+ugdΔ, KIM6+mgtC::kan, or KIM6+ugdΔmgtC::kan mutant bacteria. The infected macrophages were incubated in the presence of gentamicin, and at different times the numbers of intracellular bacteria were determined by a viable count assay. The data are averages of three experiments performed with triplicate wells, and the error bars indicate standard deviations.