Influenza viruses recovered from 14 children 2-10 days after vaccination with an egg-grown, cold-adapted influenza B vaccine (B/AA/1/86) were analyzed. Hemagglutination-inhibition (HI) assays using monoclonal antibodies did not detect antigenic differences between the vaccine strain and the viruses recovered from the vaccinees. Furthermore, nucleotide sequence analysis of the HA1 region did not reveal any changes compared to the sequence of the vaccine strain. These findings indicate that influenza B vaccine hemagglutinin is genetically stable during replication in human vaccinees. © 1995.
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