Production of a viral growth enhancing factor (enhancer) in eggs infected with influenza virus (PR 8).
D000906:Antibodies; D003168:Complement Fixation Tests; D004531:Eggs; D005321:Extraembryonic Membranes; D006386:Hemagglutination Tests; D066298:In Vitro Techniques; D007372:Interferons; D009975:Orthomyxoviridae / Q000254:growth & development*; D014776:Virus Cultivation
D000906:Antibodies; D007372:Interferons