FIG. 3.

Effects of virulence factors and antibody on phagocytosis. Nonopsonized or opsonized bacteria were incubated with neutrophils as described in the legend for Fig. 2. One hundred consecutive neutrophils were examined for the number of intracellular (green) bacteria. Data were analyzed by the Student t test. Each bar represents the mean (± the standard error of the mean) from 3 to 27 independent experiments performed in duplicate. ∗, significantly different from wild type (WT) (P < 0.05).