title: Return of epidemic A1 (H1N1) influenza virus.
abstract: Limited outbreaks of influenza were reported in the far east of the U.S.S.R. early in November, 1977, and a week or two later in cities in Siberia and the European parts of the U.S.S.R. The majority of influenza-virus isolates belonged to the H1N1 subtype of influenza-A virus, though strains of the current H3N2 subtype were also isolated. A moderate epidemic of H1N1 influenza spread throughout the country in the middle of December. Mainly children over 5 years and young adults were infected.
mesh_terms: D000293:Adolescent; D000328:Adult; D000956:Antigens, Viral / Q000032:analysis; D002648:Child; D004196:Disease Outbreaks; D006385:Hemagglutination Inhibition Tests; D006388:Hemagglutinins / Q000032:analysis; D006801:Humans; D007106:Immune Sera; D053118:Influenza A Virus, H1N1 Subtype; D009980:Influenza A virus / Q000201:enzymology / Q000276:immunology / Q000302:isolation & purification*; D007251:Influenza, Human / Q000453:epidemiology / Q000382:microbiology*; D009439:Neuraminidase / Q000032:analysis; D014586:USSR
chemical_list: D000956:Antigens, Viral; D006388:Hemagglutinins; D007106:Immune Sera; D009439:Neuraminidase