The Impact of Snail Control on the Prevalence and intensity of Schistosomiasis Mansoni In Finchaa and Wonjishoa Sugar Estates: Postpilot Control Status
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Date
2009-07
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Addis Ababa University
Abstract
Schistosoma mansoni is one of the main parasitic infections in Ethiopia which spreads due to
water resource development and population migration. Although national schistosomiasis control
program has not been established in the country, several pilot controls have been undertaken.
Most of these pilot controls were based on endod application as a mollusccicide. This study was
conducted from October 2008 to April 2009 to evaluate the impact of snail control on the
prevalence and intensity of S. mansoni in Finchaa and Wonji-Shoa sugar estates, in the
sustainability phase of schistosomiasis pilot control. The study included 302 school children
from Finchaa and 333 school children from Wonji-Shoa sugar estates. Stool specimens were
collected and examined microscopically using Kato-katz thick smear technique. The prevalence
and mean intensity of S. mansoni infection were found to be 60.26% and 287.84 + 613.37 in
Finchaa and 57% and 147.39 + 278.07 in Wonji-Shoa sugar estate respectively. In Finchaa sugar
estate, the prevalence of schistosomiasis has not shown a significant difference with the
prevalence in the post-intervention study (P = 0.13). But the mean intensity of infection has
significantly increased among the school children (P < 0.001). In Wonji-Shoa sugar estate, on the
other hand, both the prevalence and mean intensity of the disease has decreased when compared
with previous study conducted in 1990 on school children in the estate (P < 0.001). But the
disease still has high prevalence and moderate mean intensity of infection in both sugar estates.
These results in line with comparison to similar works elsewhere and their implications are also
discussed.
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Biology