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Left: Immature oocyst of Cystoisospora belli in an unstained wet mount showing a single sporoblast under ultraviolet (UV) fluorescent microscopy. Right: Immature oocyst of Cystoisospora belli in an unstained wet mount showing two sporoblasts under ultraviolet (UV) fluorescent microscopy.

Cystoisosporiasis (formerly known as isosporiasis) is an intestinal disease of humans caused by the coccidian parasite Cystoisospora belli (formerly known as Isospora belli). Cystoisosporiasis is most common in tropical and subtropical areas of the world. The parasite can be spread by ingesting contaminated food or water. The most common symptom is watery diarrhea. The infection is treatable and preventable.

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