[Structure of the hemagglutinin gene of the influenza virus during serial passages in chick embryos].

The sequence analysis of HA gene of passaged variants of A/USSR/2/85 influenza virus was carried out. It was shown that in the process of passage of virus in chick embryos the structure of HA gene was not changed. These data correlated with those obtained early during investigation of A/Leningrad/337/76 influenza virus by the oligonucleotide mapping.