Figure 6
Significant increase of CD8+ cells in the ileum of infected lambs. Ileal Peyer’s patches sections from a pair of 6 day-old matched lambs, control (A) and inoculated (B), were labelled with Ab against CD3 (red), CD8 (green) and γδTCR (blue). Increased numbers of yellow CD3+/CD8+ cells (arrow) in the lamina propria (lp) and dome (d) were seen in the inoculated animals compared with the controls. Few or no CD3+/CD8+/γδTCR+ cells were observed. Light blue dots (arrowhead) were identified as autofluorescence and thus differentiated from the specific labelling which was localised in the cell membrane. Absorptive epithelium (ae), follicle-associated epithelium (fae), follicle (f), interfollicular area (ifa). Bar 50 μm. (C) The increase of CD3+/CD8+ cells in the ileal Peyer’s patch was demonstrated by quantitative analysis of positive cells per mm2 in villi and dome, including the covering epithelium. The graphs show the median with 95% confidence interval constructed using the Bernoulli-Wilcoxon procedure. Statistically significant differences are indicated as ** p < 0.01 and *** p < 0.001.