Enteric spore-forming opportunistic parasites in HIV / AIDS.

Human Immunodeficiency Virus (HIV) infection causes progressive damage to both limbs of the immune system, which results in a plethora of opportunistic infections. Among the various opportunistic infections, gastrointestinal infections are very common in HIV / Acquired Immunodeficiency Syndrome (AIDS). Opportunistic spore-forming protozoal parasites, namely, Cryptosporidium parvum, Isospora belli, Cyclospora cayetanensis, and Microsporidia, play a major role in causing chronic diarrhea, accompanied with weight loss, in patients with HIV / AIDS. The purpose of this review is to discuss the salient microbiological, clinical, and diagnostic aspects of important enteric spore-forming opportunistic parasites in HIV / AIDS.