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SUMMARY Reports by others have described the haemagglutinins of Hong Kong (H3N2) strains and the Asian (H2N2) strains as being antigenically unrelated. Cross re- actions seen by the haemagglutination-inhibition (HI) test have been attributed to antibodies to a second major surface antigen, the neuraminidase, which is com- mon to both subtypes. However, observations on human anamnestic antibody responses suggest the two haemagglutinins are related. In the present study we re- examined the antigenic relationship of these viruses using haemagglutinin specific virus recombinants, chicken and ferret antisera, antibody equilibrium filtration methods, and cross-infection in ferrets. Data from these studies consistently demonstrated an asymmetric relationship, independent of the neuraminidase, between the H2 and H 3 strains.

Haemagglutinin Relationships of Hong Kong(H3) and Asian(H2) Influenza Strains Delineated by Antigen-Specific Recombinants