title: Letter: Negative complement-fixation tests as an immunopathological finding.
mesh_terms: D000328:Adult; D000818:Animals; D000956:Antigens, Viral / Q000032:analysis; D001172:Arthritis, Rheumatoid / Q000276:immunology; D003168:Complement Fixation Tests; D006801:Humans; D007105:Immune Complex Diseases; D007136:Immunoglobulins / Q000032:analysis; D008171:Lung Diseases / Q000276:immunology; D008180:Lupus Erythematosus, Systemic / Q000276:immunology; D009369:Neoplasms / Q000276:immunology; D011817:Rabbits / Q000276:immunology
chemical_list: D000956:Antigens, Viral; D007136:Immunoglobulins