Fig. 8

Histopathological image of colon tissues of the positive control group (non-immunized challenged with S. flexneri 2b serotype “ATCC 12022”). (a, b and c) represent examination of tissues showed moderate records of focal mononuclear inflammatory cells in the submucosal layer (red arrow) and between intestinal crypts with mild degenerative changes in lining epithelial cells, accompanied by moderate dilatation of submucosal blood vessels (red star)