A dialysable factor in the cerebrospinal fluid, fixing complement with formaldehyde.
D000914:Antibodies, Viral / Q000302:isolation & purification; D001826:Body Fluids / Q000276:immunology; D002555:Cerebrospinal Fluid / Q000276:immunology*; D003168:Complement Fixation Tests; D003956:Dialysis; D005321:Extraembryonic Membranes; D005557:Formaldehyde / Q000276:immunology*; D006801:Humans; D007251:Influenza, Human / Q000276:immunology*; D009107:Mumps / Q000276:immunology*
D000914:Antibodies, Viral; D005557:Formaldehyde