Schistosoma mansoni is one of the main parasitic infections in Ethiopia which spreads due tornwater resource development and population migration. Although national schistosomiasis controlrnprogram has not been established in the country, several pilot controls have been undertaken.rnMost of these pilot controls were based on endod application as a mollusccicide. This study wasrnconducted from October 2008 to April 2009 to evaluate the impact of snail control on thernprevalence and intensity of S. mansoni in Finchaa and Wonji-Shoa sugar estates, in thernsustainability phase of schistosomiasis pilot control. The study included 302 school childrenrnfrom Finchaa and 333 school children from Wonji-Shoa sugar estates. Stool specimens wererncollected and examined microscopically using Kato-katz thick smear technique. The prevalencernand mean intensity of S. mansoni infection were found to be 60.26% and 287.84 + 613.37 inrnFinchaa and 57% and 147.39 + 278.07 in Wonji-Shoa sugar estate respectively. In Finchaa sugarrnestate, the prevalence of schistosomiasis has not shown a significant difference with thernprevalence in the post-intervention study (P = 0.13). But the mean intensity of infection hasrnsignificantly increased among the school children (P < 0.001). In Wonji-Shoa sugar estate, on thernother hand, both the prevalence and mean intensity of the disease has decreased when comparedrnwith previous study conducted in 1990 on school children in the estate (P < 0.001). But therndisease still has high prevalence and moderate mean intensity of infection in both sugar estates.rnThese results in line with comparison to similar works elsewhere and their implications are alsorndiscussed.