title: On the classification of patients with primary immunodeficiency disorders.
mesh_terms: D000619:Aminohydrolases / Q000172:deficiency; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007111:Immunity, Cellular; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007153:Immunologic Deficiency Syndromes / Q000145:classification*; D007223:Infant; D013601:T-Lymphocytes / Q000276:immunology; D009626:Terminology as Topic; D013950:Thymus Gland / Q000002:abnormalities; D014944:World Health Organization
chemical_list: D007070:Immunoglobulin A; D007074:Immunoglobulin G; D000619:Aminohydrolases