RT Book, Section A1 Maraqa, Nizar F. A2 Kline, Mark W. SR Print(0) ID 1182904570 T1 Cystoisosporiasis T2 Rudolph's Pediatrics, 23e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259588594 LK accesspediatrics.mhmedical.com/content.aspx?aid=1182904570 RD 2024/04/23 AB Cystoisospora belli, formerly known as Isospora belli, is a coccidian unicellular protozoan parasite of the phylum Apicomplexa that primarily infects the human intestinal epithelium and has no known animal reservoir. The parasite is an uncommon cause of diarrhea in immunocompetent hosts and an opportunistic cause of watery diarrhea and weight loss in immunocompromised children and adults.