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Photomicrograph 4 of 4.
It is shown distinct, small, round bodies, reddish, attached to surface epithelium of the colon.
Biopsies were taken revealing mucosal injury with villus flattening, regenerative epithelial changes and lamina propria inflammation. Higher power shows that the surface epithilium is lined by small round organisms (arrows) measuring 2-4 mm. The appearance is characteristic of cryptosporidiosis. Most human cryptosporidial infections are caused by the species Cryptosporidium Parvum which invades and spends their life cycle in the intestinal epithelium.
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