title: Asthma and the hygiene hypothesis.
authors.forename: W J
authors.initials: WJ
authors.lastname: Anderson
authors.forename: L
authors.initials: L
authors.lastname: Watson
mesh_terms: D001249:Asthma / Q000276:immunology*; D003922:Diabetes Mellitus, Type 1 / Q000276:immunology*; D006801:Humans; D006920:Hygiene; D006967:Hypersensitivity / Q000276:immunology; D007239:Infections / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology*; D018418:Th2 Cells / Q000276:immunology