Replication and localization of bacteria in tomato leaves. A) B. thailandensis multiplication in tomato leaves was measured at one and three days post inoculation. The graph is representative of two separate experiments. Representative transmission electron micrographs show localization of bacteria in tomato leaf determined one day after infection. B) Leaves infected with B. thailandensis showing the longitudinal section of xylem vessel and C) leaves infected with B. pseudomallei showing the cross-sectional view. Bar represents 2 μm.