title: [Polymorphism of current human influenza A and B virus population].
abstract: During the past years, the etiological situation has been significantly complicated. It is characterized by simultaneous circulation of A(H1N1), A(H3N2) and influenza B viruses and by the isolation of reassortant strains and viruses, which are atypical in relation to the process of their natural variability. The antigenic properties of epidemic strains and unusual isolates were investigated. The marked heterogeneity of the A(H3N2) influenza viruses was demonstrated. It was determined by the circulation of several antigenic variants during the epidemic. Two separate antigenic lineage of the influenza B viruses--b/Victoria/2/87 and B/Yamagata/16/88--cocirculated in our country in 1991. Since 1986, all the influenza A(H1N1) viruses have been considered to be varieties of the reference strain A/Taiwan/1/86. A direct correlation was found between some atypical viruses and the vaccine strains previously used.
authors.forename: E B
authors.initials: EB
authors.lastname: Grinbaum
authors.forename: O M
authors.initials: OM
authors.lastname: Litvinova
authors.forename: A I
authors.initials: AI
authors.lastname: Bannikov
authors.forename: I B
authors.initials: IB
authors.lastname: Konovalenko
authors.forename: N Iu
authors.initials: NIu
authors.lastname: Chernookaia
authors.forename: L G
authors.initials: LG
authors.lastname: Iukhnova
authors.forename: O I
authors.initials: OI
authors.lastname: Kiselev
mesh_terms: D000956:Antigens, Viral / Q000235:genetics*; D008040:Genetic Linkage; D006801:Humans; D009980:Influenza A virus / Q000235:genetics*; D009981:Influenza B virus / Q000235:genetics*; D007251:Influenza, Human / Q000453:epidemiology / Q000821:virology*; D011110:Polymorphism, Genetic
chemical_list: D000956:Antigens, Viral