If you (mostly) believe in worms, what should you think about WASH?

Abstract

Thanks go to Aaron Gertler, Louis_Dixon, and Adam Bricknell for their extremely helpful feedback on earlier drafts of this post. This question, and the thinking behind the post, started from research Sanjay and I were performing on deworming for SoGive. SoGive is an organisation which provides services to donors to help them to achieve high impact donations.