Immune function in the elderly.
D000368:Aged; D000375:Aging; D005260:Female; D005527:Food, Fortified; D006801:Humans; D007109:Immunity; D007114:Immunization; D007239:Infections / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D008297:Male; D009369:Neoplasms / Q000276:immunology; D012882:Skin Tests