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In the past, aquatic habitats in the area have been studied separately; however, recent collections of<jats:italic>B. nasutus<\/jats:italic>snails and shells indicated that many of these ponds are in fact connected during and following sufficient rains. Satellite imagery and a geographical information system (GIS) were used to survey the main water courses and potential drainage routes, to locate potential source populations of snails and to determine probable snail dispersal routes. The 2 water bodies implicated as being the most important<jats:italic>Schistosoma haematobium<\/jats:italic>transmission foci in the area were found to differ in their degree of connectivity to other<jats:italic>B. nasutus<\/jats:italic>source habitats. One pond becomes connected even after normal rains, while the other pond requires prolonged rains or flooding to become connected with source habitats. Consequently, the transmission foci differ in their susceptibility to snail population control measures. Spatially explicit dispersal models that consider the spatial and temporal patterns of connectivity between aquatic habitats will contribute to improved snail surveillance and more focused control for urinary schistosomiasis at a local level.<\/jats:p>","DOI":"10.1017\/s0031182006001594","type":"journal-article","created":{"date-parts":[[2006,12,11]],"date-time":"2006-12-11T12:39:46Z","timestamp":1165840786000},"page":"683-693","source":"Crossref","is-referenced-by-count":32,"title":["Hydrological modelling of snail dispersal patterns in Msambweni, Kenya and potential resurgence of<i>Schistosoma haematobium<\/i>transmission"],"prefix":"10.1017","volume":"134","author":[{"given":"J.\u00a0A.","family":"CLENNON","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"C.\u00a0H.","family":"KING","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"E.\u00a0M.","family":"MUCHIRI","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"U.","family":"KITRON","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"56","published-online":{"date-parts":[[2006,12,11]]},"reference":[{"key":"S0031182006001594_ref014","first-page":"87","volume-title":"Human 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