title: Deficiency of IgG4: a disorder associated with frequent infections and bronchiectasis that may be familial.
mesh_terms: D000293:Adolescent; D000328:Adult; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology; D001424:Bacterial Infections / Q000209:etiology*; D001987:Bronchiectasis / Q000209:etiology*; D002648:Child; D002675:Child, Preschool; D004198:Disease Susceptibility; D005260:Female; D006801:Humans; D017099:IgG Deficiency; D007074:Immunoglobulin G / Q000276:immunology; D007136:Immunoglobulins / Q000032:analysis; D007153:Immunologic Deficiency Syndromes / Q000150:complications / Q000235:genetics / Q000276:immunology*; D007223:Infant; D008297:Male; D008875:Middle Aged; D011863:Radioimmunoassay; D012141:Respiratory Tract Infections / Q000209:etiology*
chemical_list: D000888:Antibodies, Anti-Idiotypic; D007074:Immunoglobulin G; D007136:Immunoglobulins