Disease caused by infection with a species of Isospora, such as I. belli of humans; human disease usually is mild except in cases of immunodeficiency, as in AIDS, where it may cause an intractable diarrhea.
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isos·po·ri·a·sis (i-sos″pə-riґə-sis) 1. infection with protozoa of genus Isospora. 2. cystoisosporiasis.Medical dictionary. 2011.