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. 1981 Mar;37(3):845–853. doi: 10.1128/jvi.37.3.845-853.1981

Antigenic drift in the hemagglutinin of the Hong Kong influenza subtype: correlation of amino acid changes with alterations in viral antigenicity.

M J Sleigh, G W Both, P A Underwood, V J Bender
PMCID: PMC171079  PMID: 6164798

Abstract

The nucleotide sequence of the gene coding for the large subunit of influenza virus hemagglutinin (HA1) was determined for strains A/NT/60/68, A/Eng/878/69, and A/Qu/7/70, three early isolates of the Hong Kong subtype. Sequences were obtained by the dideoxy chain termination method, using reverse transcriptase to synthesize partial DNA copies of the RNA gene. HA1 amino acid sequences predicted from the gene sequences were compared with published data for strains A/Aichi/2/68 and A/Vic/3/75. Compared with earlier strains, the HA1s of A/eng/878/69 and A/Qu/7/70 each contained three amino acid changes. Some of these were also found in A/Vic/3/75, but some were unique to the particular strain. When all of the strains were titrated with a panel of monoclonal antibodies directed against A/NT/60/68, alterations in viral antigenicity could be correlated with particular amino acid changes. The existence of multiple pathways for viral evolution during antigenic drift is discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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