Intestinal isosporiasis in patients with acquired immunodeficiency syndrome (AIDS). Pathologic diagnosis in small intestinal mucosal biopsies

- The diagnosis of isosporiasis in AIDS patients requires tissue analysis.
- The differential diagnosis of isosporiasis in small intestinal biopsies includes other coccidiosis and microsporidiosis.
- The pathologic diagnosis is extremely difficult when Ciclospora cayetanensis is suspected.
- Schizogonic and gametogonic structures are the morphological key to differentiate Isospora belli from Ciclospora cayetanensis.