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. 1988 Feb;62(2):488–495. doi: 10.1128/jvi.62.2.488-495.1988

Four viral genes independently contribute to attenuation of live influenza A/Ann Arbor/6/60 (H2N2) cold-adapted reassortant virus vaccines.

M H Snyder 1, R F Betts 1, D DeBorde 1, E L Tierney 1, M L Clements 1, D Herrington 1, S D Sears 1, R Dolin 1, H F Maassab 1, B R Murphy 1
PMCID: PMC250559  PMID: 3336068

Abstract

Clinical studies previously demonstrated that live influenza A virus vaccines derived by genetic reassortment from the mating of influenza A/Ann Arbor/6/60 (H2N2) cold-adapted (ca) donor virus with epidemic wild-type influenza A viruses are reproducibly safe, infectious, immunogenic, and efficacious in the prevention of illness caused by challenge with virulent wild-type virus. These influenza A reassortant virus vaccines also express the ca and temperature sensitivity (ts) phenotypes in vitro, but the genes of the ca virus parent which specify the ca, ts, and attenuation (att) phenotypes have not adequately been defined. To identify the genes associated with each of these phenotypes, we isolated six single-gene substitution reassortant viruses, each of which inherited only one RNA segment from the ca parent virus and the remaining seven RNA segments from the A/Korea/1/82 (H3N2) wild-type virus parent. These were evaluated in vitro for their ca and ts phenotypes and in ferrets, hamsters, and seronegative adult volunteers for the att phenotype. We found that the polymerase PA gene of the ca parent specifies the ca phenotype and that the PB2 and PB1 genes independently specify the ts phenotype. The PA, M, PB2, and PB1 genes of the ca donor virus each contribute to the att phenotype. The finding that four genes of the ca donor virus contribute to the att phenotype provides a partial explanation for the observed phenotypic stability of ca reassortant viruses following replication in humans.

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Selected References

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