Sightsavers worm intensity [2017]
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AscarisTrichurisHookwormSchistosomiasis mansoniSchistosomiasis haematobiumTotal person-years of treatmentProportion of treatmentsDetails
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Guinea12%14%24%52%52%276,3643%
We combine data on the prevalence of "any STH infection" with GBD estimates to approximate the proportion of STH infections coming from each STH species. We assume half of SCH infections are S. haematobium and half are S. mansoni. Simple (uncorrelated) coinfection is assumed for both STH and SCH.
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DRC10%8%7%2%2%92,0951%
We combine data on the prevalence of "any STH infection" with GBD estimates to approximate the proportion of STH infections coming from each STH species. We assume half of SCH infections are S. haematobium and half are S. mansoni. Simple coinfection is assumed for both STH and SCH.
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Nigeria3%0%17%0%17%7,624,85595%
We combine district-level data on the prevalence of any STH and any SCH with state-level mapping results disaggregated by worm species to approximate overall prevalence. Simple coinfection is assumed for both STH and SCH.
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Notes
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Treatment numbers were provided directly by Sightsavers.
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We assume there is no correlation between the odds of having one species of worm infection and the odds of having another species of infection. This may lead us to underestimate the prevalence of individual species of worms.
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