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Amino Acid Sequences of Haemagglutinins of Influenza Viruses of the H₃ Subtype Isolated from Horses

Division of Virology, National Institute for Medical Research, Mill Hill, London NW7 1AA, U.K.
and¹ Department of Biochemistry and Molecular Biology, Harvard University, 7 Divinity Avenue, Cambridge, Massachusetts 02138, U.S.A.

The amino acid sequence of the haemagglutinin of A/equine/Miami/63 (H₃N₈), the prototype influenza virus of the H₃ subtype from horses, is deduced from the nucleotide sequence of virus RNA and compared with the sequences of haemagglutinins of viruses of this subtype isolated from humans [X-31 (H₃N₂)] and from birds [A/duck/Ukraine/63 (H₃N₈)] and with the sequence of the haemagglutinin of A/equine/Fontainebleau/79 (H₃N₈) a virus isolated from a recent outbreak of equine influenza. The amino acid sequence differences detected are discussed with reference to the structure of the molecules, their antigenicity and antigenic drift in influenza viruses isolated from horses.

Keywords: influenza A virus, horses, amino acid sequence, antigenic drift

Received 24 September 1984; accepted 14 November 1984.

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