Hygiene hypothesis only a theory.
Whisnant
R
R
D000818:Animals; D000829:Animals, Domestic; D000941:Antigens / Q000276:immunology; D001249:Asthma / Q000453:epidemiology / Q000209:etiology* / Q000276:immunology; D004198:Disease Susceptibility / Q000276:immunology; D004285:Dogs; D004781:Environmental Exposure / Q000517:prevention & control; D006801:Humans; D006920:Hygiene / Q000592:standards*; D006967:Hypersensitivity / Q000453:epidemiology / Q000209:etiology* / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology
D000941:Antigens