A retroviral positive patient presents with frequent diarrheal episodes. Stool examination reveals acid-fast oocyst of size 4-6 microns. What could be the probable diagnosis?: (A) Toxoplasma gondii, (B) Cryptosporidium parvum, (C) Coccidioides immitis, (D) Sarcocystis
Answer is B. In HIV positive patients, following organisms cause diarrhea. Cryptosporidium parvum- 4-6 micron oocyst Cyclospora - 2-12 micron oocyst Isospora belli23-36- micron oocyst