| effect of mass chemotherapy and piped water on numbers of schistosoma haematobium and prevalence in bulinus globosus in kwale, kenya. | from june 1982 to may 1986 in a small village in kwale, kenya, we studied seasonal fluctuations in populations of bulinus globosus, prevalence of schistosoma haematobium infection in this snail, and effects of chemotherapy and piped water supply on infection rate of snails. in the perennially-flowing pemba river, relatively small numbers of snails were collected; they were found only during the hot dry season (december to march). in a tributary stream, the kadingo river, whose flow ceased at the ... | 1988 | 3152776 |