| Protozoal | | Microsporidium* | | Cryptosporidium* | | Isospora belli | | Giardia lamblia | | Entamoeba histolytica | | Leishmania donovani | | Blastocystis hominis | | Cyclospora sp | | Viral | | Cytomegalovirus* | | Herpes simplex | | Adenovirus | | Rotavirus | | Norwalk | | HIV | | Gut neoplasms | | Lymphoma | | Kaposi's sarcoma | | Pancreatic insufficiency | | | Bacterial | | Salmonella* | | Campylobacter* | | Mycobacterium avium complex | | Mycobacterium tuberculosis | | Clostridioides (formerly Clostridium) difficile | | Shigella | | Small bowel bacterial overgrowth | | Vibrio sp | | Fungal | | Histoplasmosis | | Coccidiomycosis | | Idiopathic | | "AIDS enteropathy" | |
