02154nas a2200433   4500000000100000008004100001653004100042653002200083653003600105100001500141700001700156700001200173700001300185700001400198700002100212700001200233700001300245700001800258700001400276700001400290700001400304700001400318700001500332700001200347700001500359700001300374700001300387700001600400700001900416700001300435700001200448700001400460245015400474856008500628300000800713490000700721520097800728022001401706       2019                            d10aSoil-transmitted helminthiasis (STH)10aWaSH intervention10aSoil-transmitted helminth (STH)1 aVaz Nery S1 aPickering AJ1 aAbate E1 aAsmare A1 aBarrett L1 aBenjamin-Chung J1 aBundy D1 aClasen T1 aClements AC A1 aColford J1 aErcumen A1 aCrowley S1 aCumming O1 aFreeman MC1 aHaque R1 aMengistu B1 aOswald W1 aPullan R1 aOliveira RG1 aEinterz Owen K1 aWalson J1 aYouya A1 aBrooker S00aThe role of water, sanitation and hygiene interventions in reducing soil-transmitted helminths: interpreting the evidence and identifying next steps.  uhttps://parasitesandvectors.biomedcentral.com/articles/10.1186/s13071-019-3532-6  a2730 v123 a<p>The transmission soil transmitted helminths (STH) occurs via ingestion of or contact with infective stages present in soil contaminated with human faeces. It follows therefore that efforts to reduce faecal contamination of the environment should help to reduce risk of parasite exposure and improvements in water, sanitation and hygiene (WASH) are seen as essential for the long-term, sustainable control of STH. However, the link between WASH and STH is not always supported by the available evidence from randomised controlled trials, which report mixed effects of WASH intervention on infection risk. This review critically summarises the available trial evidence and offers an interpretation of the observed heterogeneity in findings. The review also discusses the implications of findings for control programmes and highlights three main issues which merit further consideration: intervention design, exposure assessment, and intervention fidelity assessment.</p>
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