Small bowel (small intestine)
Infectious disorders
Isospora belli


Topic Completed: 1 August 2012

Revised: 12 March 2019

Copyright: 2003-2019, PathologyOutlines.com, Inc.

PubMed Search: Isospora belli small bowel
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Cite this page: Gulwani H. Isospora belli. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/smallbowelisospora.html. Accessed May 23rd, 2019.
Definition / general
  • Coccidian parasite that infects epithelial cells of small intestine
  • Causes chronic diarrhea and acalculous cholecystitis in AIDS patients (Indian J Med Res 2011;134:878)
Diagrams / tables

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Life cycle

Diagnosis
  • Cysts in stool, biopsy (H&E or EM)
Case reports
Microscopic (histologic) description
  • Cysts present in parasitophorous vacuole in lamina propria (Hum Pathol 2001;32:500)
  • Ovoid developmental forms are identified in and beneath epithelial cells near villus tip
Microscopic (histologic) images

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Oocyst of C. belli in epithelial cells of mammalian host

Isospora belli (20 - 30 μm
long by 10 - 19 μm wide)
- immature oocyst
(modified acid fast stain)

Positive stains
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