Irregular appearance of antiviral activity of complement in the hemagglutination-inhibition test.
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D000818:Animals; D003165:Complement System Proteins / Q000032:analysis*; D006168:Guinea Pigs; D006385:Hemagglutination Inhibition Tests; D006863:Hydrogen-Ion Concentration; D009980:Influenza A virus / Q000276:immunology; D009981:Influenza B virus / Q000276:immunology
D003165:Complement System Proteins