General Parasitology and Protozoa
A patient with AIDS has acute diarrhea. The stool revealed an oval organism (8 to 9 micron in diameter) that was acid-fast and fluoresced blue under ultraviolet light. The most likely identification of this organism is? (AIPG 2012)
a. Coccidian-like bodies have been identified in stools of some patients with diarrhea.
b. These organisms appear to be similar to blue-green algae and were referred to as Cyanobacterium-like until they were recently reclassified as Cyclospora. They are larger than the microsporidia and resemble neither Giardia nor Prototheca nor other algae-like organisms.
c. Unlike Cryptosporidium, these organisms fluoresce under ultraviolet light.
d. The diarrhea can be prolonged and relapsing, and the treatment is usually trimethoprim-sulfamethoxazole.