Propagation of the PR8 strain of influenza A virus in chick embryos. III. Properties of the incomplete virus produced in serial passages of undiluted virus.
D003673:Defective Viruses; D009980:Influenza A virus; D009975:Orthomyxoviridae / Q000472:pathogenicity*; D012098:Reproduction; D012692:Serial Passage; D014774:Virulence; D014780:Viruses
INFLUENZA VIRUS/virulence