Protozoa that parasitize the human intestine include Entamoeba histolytica, Blastocystis hominis, Trichomonas hominis, Cryptosporidium parvum, Giardia lamblia, Balantidium coli, Isospora, and other protozoa. Most intestinal protozoan infections can cause acute or chronic diarrhea in healthy individuals and may result in intractable, life-threatening illness in patients in immunosuppressive stat...
