Immunogenic Properties of the Small Chain HA2 of the Haemagglutinin of Influenza Viruses

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Abstract
The small chain of influenza virus hemagglutinin, HA2 was isolated by a selective enzymic removal of HA1 or by preparative sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Anti-HA2 specific antisera and monoclonal antibodies were subtype-specific in immunodiffusion tests and radioimmunoassays. These antibodies did not inhibit hemagglutination or hemolysis, did not prevent virus releaes, did not neutralize infectivity, and HA2 did not induce a protective immunity. HA2-specific antigenic determinants could not be demonstrated on the surface of infected cells. Lymphocytes from pre-immunized mice could not be stimulated by HA2 to exert a cytotoxic effect.