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Live-attenuated influenza virus vaccines can be generated by reassortment of gene segments between an attenuated donor strain and a virulent wild-type virus. The annual production schedule for the seasonal influenza vaccine necessitates rapid and efficient genotyping of the reassorted progeny to identify the desired vaccine strains. This study describes a multiplex RT-PCR system capable of identifying...
A human influenza B/Lee/40 virus was cold-adapted by serial passages in embryonated chicken eggs, at progressively lower temperatures, for possible use as a future influenza B vaccine donor strain. Temperature sensitive and cold-adapted phenotypes were achieved as a consequence of the adaptation process. It was determined that the virus was attenuated in mice since the replication of the viral genome...
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