The anti-retrovirals come too late for Principal Skiller. His viral load is somewhat reduced but he develops severe diarrhea > 10 bowel movements a day. His mother calls an ambulance to take him to the hospital again. He is extremely dehydrated and given intravenous rehydration as supportive therapy. Fecal samples are collected and all his fecal smears show the presence of small round acid-fast parasites. There is no effective treatment for this parasitic infection in immunosuppressed individuals and unfortunately Principal Skiller is now too weak to recover. Which parasitic gastrointestinal disease does he succumb to?
A. Cryptosporidiosis
B. Isosporiasis
C. Toxoplasmosis
D. All of the above