FIG. 6.

Comparative survival of S. enterica serovar Thompson pGT-Kan in vesicles released by Tetrahymena SSU (gray bars) and as free cells remaining uningested in the same solution (black bars). Cell viability was evaluated by PI staining. Each value represents the mean and standard error of the mean of the proportion of viable serovar Thompson cells over the total number of cells per vesicle or per area around the vesicle for 100 observations under the epifluorescence microscope. For each treatment, bars with different letters depict significant differences between the means at P < 0.05.