Abstract
Concerted efforts to study the molecular biology of influenza viruses and the ability to genetically engineer them have dramatically advanced our understanding of the functions of influenza viral genes and gene products. The only nonstructural protein (NS1) coded for by the influenza virus was shown to possess interferon antagonist activity and thus to play an important role in countering the interferon (antiviral) response of the host following infection. Influenza A and B virus mutants with "weak" anti-interferon activity are highly attenuated because the host is able to mount an effective interferon response. It is suggested that these NS1-modified attenuated influenza viruses can induce a protective immune response and that they are ideal live virus vaccine candidates against influenza.
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