Fig. 1.

Light microscopical findings. (a) Crypt of the caudal jejunum with parasitic structures (second generation schizont, arrow above), crypt with granulocytic infiltration (arrow below) in animals during the prepatent period. H&E, Obj. 40 ×. (b) Cecal mucosa with second generation schizonts (left arrow) and oocysts (right arrow) in animals during the patent period. H&E, oil immersion, 100 ×. (c) Acute parasitic typhlitis, crypts filled with parasitic structures (right arrow), increased numbers of inflammatory infiltrates (middle arrow). Note loss of superficial epithelium (arrow above). H&E, Obj. 10 ×.