A HIV positive individual having diarrheal episodes stool examination reveals on oocyst of size 8-10 Micron, what could be the diagnosis?: (A) Cyclospora, (B) Cryptococcus, (C) Cryptosporidium parvum, (D) Isospora
Answer is A. Parasites Size of oocyst Cryptosporidium parvum 4-6 micron Cyclospora 8-10 micron Isospora 23-36 micron They all are acid fast so the appear similar in colour under acid fast stain. So, size of oocyst is used to identify them.