| inland valley swamp rice development: malaria, schistosomiasis, onchocerciasis in south central sierra leone. | the prevalence of malaria, schistosomiasis and onchocerciasis was determined in 1,106 residents of five villages in the moyamba district, southern sierra leone, to determine whether inland valley swamp (ivs) development was associated with changes in the prevalence of malaria, schistosomiasis and onchocerciasis in these villages. these parasitic diseases were studied in four villages receiving ivs, food and agricultural organization (fao) assistance and in one village not receiving fao assistanc ... | 1994 | 8183970 |