"complement fixation"@en-us . . . . "100552999"@en-us . . . . "an immune response in which an antigen-antibody combination inactivates a complement (so it is unavailable to participate in a second antigen-antibody combination)"@en-us . "00861382-n"^^ . . "0.25"^^ . "0"^^ . "complement fixation"^^ . . "100809947"@en-us . . "100861382"^^ . .