Environmental Epidemiology of Intestinal Schistosomiasis in Uganda: Population Dynamics of Biomphalaria (Gastropoda: Planorbidae) in Lake Albert and Lake Victoria with Observations on Natural Infections with Digenetic Trematodes

Table 3

Biomphalaria infections along Lake Albert.

Type of cercariae	Proportion of infected Biomphalaria	Species infected			Location affected
		B. sudanica	B. pfeifferi	B. stanleyi	Bugoigo	Walukuba	Piida
Human infective cercariae (S. mansoni cercariae)	15.8%; (87/551)	25.3%; (22/87)	5.7%; (5/87)	69%; (60/87)	27.6%; (24/87)	63.2%; (55/87)	9.2%; (8/87)
Nonhuman infective cercariae	84.2%; (464/551)	45.5%; (211/464)	11.6%; (54/464)	42.9%; (199/464)	47.6%; (221/464)	43.1%; (200/464)	9.3%; (43/464)