title: The Hygiene Hypothesis.
authors.forename: Arthur T
authors.initials: AT
authors.lastname: Johnson
mesh_terms: D001424:Bacterial Infections / Q000276:immunology* / Q000517:prevention & control*; D004781:Environmental Exposure; D004785:Environmental Pollutants / Q000276:immunology; D006801:Humans; D006920:Hygiene; D061148:Hygiene Hypothesis; D007113:Immunity, Innate / Q000276:immunology; D007114:Immunization / Q000379:methods*; D018448:Models, Immunological
chemical_list: D004785:Environmental Pollutants