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Cystoisospora belli
''Cystoisospora belli'', previously known as ''Isospora belli'', is a parasite that causes an intestinal disease known as cystoisosporiasis.〔Centers For Disease Control: http://www.cdc.gov/parasites/cystoisospora/index.html〕 This protozoan parasite is opportunistic in immune suppressed human hosts.〔 It primarily exists in the epithelial cells of the small intestine, and develops in the cell cytoplasm. The distribution of this coccidian parasite is cosmopolitan, but is mainly found in tropical and subtropical areas of the world such as the Caribbean, Central and S. America, India, Africa, & S.E. Asia. In the U.S., it is usually associated with HIV infection and institutional living.
== Morphology ==
A fully mature (sporulated) oocyst of Isospora genus is a spindle-shaped body that has two sporocysts that contain four sporozoites each. The oocysts of ''Cystoisospora belli'' are long and oval shaped. They measure between 20 and 33 micrometers in length and between 10 and 19 micrometers wide.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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