Cystoisospora is a topic covered in the Johns Hopkins HIV Guide.

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  • Coccidian protozoal parasite; mature oocysts (30 x 15 μm) sporulate outside host.
  • Sporulated oocysts are infective, sporozoites penetrate enterocytes of small intestine and develop into trophozoites.
  • Transmission occurs by ingestion of contaminated water and food.[3]
  • Endemic in Central and S. America, Africa, and S.E. Asia; in U.S. associated with immunosuppression.
  • Self-limited infection in immunocompetent host.

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Last updated: April 5, 2018