title: Old age and immunity.
abstract: Changes in immunoglobulin production and delayed-type hypersensitivity occur in the elderly, making it difficult for the aging immune system to meet new challenges, such as infectious agents or neoplastic cells. The maintenance and repair of host defenses is thus both a significant scientific and social goal.
mesh_terms: D000368:Aged; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000276:immunology; D007111:Immunity, Cellular; D007136:Immunoglobulins / Q000032:analysis / Q000096:biosynthesis; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D007136:Immunoglobulins