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Studies with Antibody to the Purified Haemagglutinin of an Influenza Ao Virus

Division of Virology, National Institute for Medical Research, Mill Hill, London, England

Antiserum was prepared in rabbits against purified haemagglutinin obtained from A0/BEL virus. The antiserum had potent virus-neutralizing and haemagglutination-inhibiting activity, but was free of antibody to A0/BEL neuraminidase or to influenza A type-specific ribonucleoprotein. In immunodiffusion tests, the anti-haemagglutinin serum gave precipitin reactions with all A0 and A1 virus strains tested but did not react with human A2 viruses or avian or porcine influenza A viruses. The studies suggested a close immunological relationship between the haemagglutinins of A0 and A1 influenza viruses which was not revealed by haemagglutination-inhibition tests.

Received 4 May 1970; accepted 28 July 1970.