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 4

Biomphalaria infections along Lake Victoria.

Type of cercaria	Proportion of infected Biomphalaria	Species infected			Location affected
		B. sudanica	B. pfeifferi	B. choanomphala	Bugoto	Lwanika	Bukoba
Human infective cercariae (S. mansoni cercariae)	13.9%; (39/280)	22.5%; (9/40)	20%; (8/40)	57.5%; (23/40)	50%; (20/40)	17.5%; (7/40)	32.5%; (13/40)
Nonhuman infective cercariae	85.7%; (240/280)	41.3%; (99/240)	41.7%; (100/240)	17.1%; (41/240)	13.8%; (33/240)	49.2%; (118/240)	37.1%; (89/240)
Human infective cercariae and nonhuman infective cercariae coinfections	0.4%; (1/280)	0%	100%; (1/1)	0%	0%	0%	100%; (1/1)