FIG 4.

Macrophage infiltration in PP following Y. enterocolitica WT or Y. enterocolitica ΔyopH infection. Macrophages in Peyer's patches (PP) of infected mice (day 3 after infection) were stained with F4/80 and CD11b and subjected to flow cytometry analysis. (A) Representative dot plots showing analysis of macrophages in PP from control (PBS), Y. enterocolitica WT-, and Y. enterocolitica ΔyopH-infected mice. The numbers in the plots indicate the percentages of labeled cells in representative mice. Percentages (B) and absolute numbers (C) of macrophages in the PP of Y. enterocolitica WT- and ΔyopH-infected mice are presented. The data are the summary results of 2 experiments. Each symbol represents an individual mouse; horizontal lines indicate the means (*, P < 0.05; **, P < 0.01).