[Antigenic structure of hemagglutinins of influenza H1N1 (Hsw1N1) virus isolated from humans and ducks].

The method of specific adsorption followed by the use of antisera in HI test and competitive enzyme immunoassay was used to study the antigenic composition of hemagglutinins (HA) Hsw1 in influenza viruses isolated in 1982 from humans in Bulgaria and in 1976 in Canada from ducks as well as their antigenic relationships with HA of Hsw1 variant isolated from swine and man. Hemagglutinins of Hsw1 strains isolated from man in Bulgaria and Alma-Ata were found to be similar to HA of A/New Jersey/8/76 virus in two determinants and with hemagglutinin of the classic virus of swine in three determinants. The HA of A/duck/Alberta/35/76 virus was similar in three determinants to HA of A/New Jersey/8/76 virus and in two determinants with other Hsw1 variants.

[Antigenic specificity of neuraminidase and structure of neuraminidase gene of influenza A(H1N1) serotype Hsw1N1 viruses isolated from man and animals].

The enzyme immunoassay and neuraminidase activity inhibition test using polyclonal and monospecific antineuraminidase sera were employed to establish the similarities and differences in the antigenic structure of neuraminidase of influenza A viruses (H1N1), serovariant Hsw1N1, isolated from man in Alma-Ata (USSR), 1984, New Jersey (USA), 1976, and Pazardjik (BPR), 1982, as well as from swine and birds. Oligonucleotide mapping revealed significant structural differences in the genes coding for neuraminidase of Hsw1N1 viruses. The experimental results indicate a high degree of the enzyme variability in this group of viruses.

[The use of colloidal gold-labelled antibodies for demonstrating viral antigens].

The principal possibility of using antibodies conjugated with colloid gold for better visualization of viruses, viral antigens, and their immune complexes in electron microscope was studied on the experimental model of HBs-antigen and Venezuelan equine encephalomyelitis virus. The same method was used for the study of the thin structure of influenza A (H1N1) virus hemagglutinins using monoreceptor antisera.

[Comparative characteristics of hemagglutinins of influenza A viruses with antigenic structure Hsw1N1 isolated from man and animals].

Competitive radioimmunoassay was used to study the antigenic composition of hemagglutinin of Hsw1N1 viruses isolated from man in comparison with hemagglutinin Hsw1 of influenza virus of swine and ducks. The data of oligonucleotide analysis of the 4th RNA segment coding for hemagglutinin in these viruses are presented. It has been shown that in Alma-Ata, 1984-1985, influenza viruses Hsw1N1 were isolated with the antigenic structure of hemagglutinin and with the hemagglutinin gene identical with those of the classical influenza virus of swine A/Swine/Iowa/15/30 but differing from virus A/New Jersey/8/76.

[Immunological analysis of the surface components of the influenza virus similar to the serovariant A (Hsw1N1) isolated in Alma-Ata 1984-1985].

The results of immunological analysis of the antigenic structure of hemagglutinin and neuraminidase of influenza A (serovariant Hsw 1) isolates recovered in Alma-Ata in 1984-1985 are presented. By means of specific adsorption and immunoprecipitation the antigenic structure of new isolates was shown to be very similar to that of the A/swine/Iowa/15/30 strain.