title: IgG1 subclass deficiency in patients with chronic fatigue syndrome.
mesh_terms: D000328:Adult; D002908:Chronic Disease; D004406:Dysgammaglobulinemia / Q000150:complications / Q000276:immunology*; D005221:Fatigue / Q000276:immunology*; D005260:Female; D006801:Humans; D017099:IgG Deficiency; D008297:Male; D013601:T-Lymphocytes / Q000276:immunology