title: Troubled waters.
mesh_terms: D000818:Animals; D003457:Cryptosporidiosis / Q000453:epidemiology / Q000209:etiology*; D003458:Cryptosporidium / Q000302:isolation & purification; D004196:Disease Outbreaks; D004739:England; D006801:Humans; D014876:Water Pollution / Q000517:prevention & control*