title: The hygiene hypothesis: epidemiologic evidence.
authors.affiliation: Consiglio Nazionale Richerche, Rome, Italy. se.bonini-cnr@flashnet.it
authors.forename: Sergio
authors.initials: S
authors.lastname: Bonini
mesh_terms: D002648:Child; D016021:Epidemiologic Studies; D006801:Humans; D006920:Hygiene; D006967:Hypersensitivity / Q000453:epidemiology / Q000209:etiology* / Q000276:immunology; D015212:Inflammatory Bowel Diseases / Q000453:epidemiology / Q000209:etiology* / Q000276:immunology* / Q000382:microbiology; D018417:Th1 Cells / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology