| transmission of urinary schistosomiasis in sukumaland, tanzania. 1. snail infection rates and incidence of infection in school children. | seasonal density fluctuations of bulinus nasutus populations with accompanying schistosoma haematobium infection rates in relation to rainfall and habitat water volumes were studied at ukiriguru, mwanza, tanzania. alongside the snail investigations, 50 school children initially negative for urinary schistosomiasis were examined regularly to determine seasonal incidence rates for the infection. of the 17,646 b. nasutus collected in 2 years, 156 (0.88%) were found shedding cercariae. snail populat ... | 1988 | 3192912 |