[Analysis of the nature of virus-associated DNA in the influenza virus].

DNA sequences comprising about 5% of virus RNA were found to be present in nucleoids of influenza virus grown in chick embryos. DNA was found in two influenza virus strains under study belonging to different antigenic groups: HONI and H3N2. No DNA was demonstrated in nucleoids of a paramyxovirus, Newcastle disease virus, grown under analogous conditions. The virus-associated DNA belongs to unique sequences of cell DNA.