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- Former name: isospora
- Coccidian protozoal parasite; mature oocysts (30 x 15 μm) sporulate outside host.
- Sporulated oocysts are infective, sporozoites penetrate enterocytes of small intestice & develop into trophozoites.
- Transmission occurs by ingestion of contaminated water & food.
- Endemic in Central & S. America, Africa, & S.E. Asia; in U.S. relatively rare and associated with immunosuppression.