The demonstration of substances in human sera which inhibit complement fixation in antigen-antibody systems of lymphogranuloma venereum, psittacosis, mumps, Q fever, and lymphocytic choriomeningitis.
D003165:Complement System Proteins; D006801:Humans; D008216:Lymphocytic Choriomeningitis; D008219:Lymphogranuloma Venereum; D009107:Mumps; D010084:Oxidation-Reduction; D009956:Psittacosis; D011778:Q Fever / Q000276:immunology*; D044967:Serum; D014777:Virus Diseases / Q000276:immunology*
D003165:Complement System Proteins
COMPLEMENT; Q FEVER/immunology; VIRUS DISEASES/immunology