There are no known organismal vectors or reservoirs of Isosporiasis. Transmission is primarily through ingestion of contaminated food or water (3).
Epidemiology and Country Information
The distribution of Isosporiasis incidence is worldwide, but is greater in tropical and subtropical regions. Greater Isosporiasis incidence also occurs in regions with high prevalance of HIV infection or poor sanitation (3).
"Isosporiasis is the initial AIDS-defining illness in approximately 2-3% of patients with AIDS in Africa. In patients with AIDS who are from South America, 10% of patients with chronic diarrhea have isosporiasis. In patients with AIDS who are from Haiti and Africa, 7-20% of patients with chronic diarrhea have isosporiasis" (5)