Von Magnus phenomenon –
Correct Answer: Virus yields has high hemagglutination titre but low infectivity
Description: Abnormal replicative cycles of viruses
Von Magnus phenomenon
when cells are infected with a high dose of influenza virus, there is defective assembly during replication and the produced virus has high hemagglutinin titre but low infectivity.
Abortive infection
Due to defective maturation or assembly, either no release of virions occur or the progeny of a virus is noninfectious.
Defective viruses
Some viruses are genetically defective and require the help of simultaneously infected helper virus for replication. eg. HDV, Rous sarcoma virus.
Category:
Microbiology
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