The immune reactivity to both haemagglutinin glycopolypeptides HA1 and HA2 [prepared from bromelain-released haemagglutinin of influenza virus A/Dunedin/4/73 (H3N2)], was demonstrated by both gel double immundiffusion and radioimmunoassay in human convalescent sera obtained after natural infection during influenza epidemics in 1974/75 and 1976/77. In gel double immunodiffusion, the precipitin line(s) corresponding to glycopolypeptide HA1 were always more distinct than precipin line(s) corresponding to glycopolypeptide HA2. In radioimmunoassay, human convalescent sera revealed higher titres for binding of 125-I-labelled HA2 than for 125-I-labelled HA1. Characterization of human convalescent sera was completed by haemagglutination-inhibition test.
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