Investigation of the hygiene hypothesis: current issues and future directions.
Ponsonby
A-L
AL
Kemp
A
A
D000818:Animals; D002675:Child, Preschool; D006801:Humans; D006920:Hygiene; D006969:Hypersensitivity, Immediate / Q000453:epidemiology / Q000209:etiology* / Q000276:immunology; D007107:Immune System / Q000502:physiology; D007223:Infant; D007239:Infections / Q000150:complications* / Q000276:immunology; D006255:Rhinitis, Allergic, Seasonal / Q000209:etiology* / Q000276:immunology; D035781:Siblings