[Epidemiologic, immunologic and clinical study on selective IgA deficiency].
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001402:B-Lymphocytes / Q000276:immunology; D002648:Child; D002675:Child, Preschool; D002681:China; D004406:Dysgammaglobulinemia / Q000453:epidemiology* / Q000276:immunology; D005260:Female; D006801:Humans; D017098:IgA Deficiency; D007223:Infant; D008297:Male; D008875:Middle Aged; D013601:T-Lymphocytes / Q000276:immunology