title: Surveillance of the antibody status to current influenza strains in the Norwegian population. 2: Antibodies to the A/USSR/90/77 (H1N1) virus in various age groups after the second epidemic wave.
abstract: Over 950 randomly selected sera from various regional bacteriological laboratories, collected in October 1979, were assayed for the presence of haemagglutination-inhibition antibodies to current influenza strains. It was shown that in contrast to the previous year (1978), most age groups had significant levels of antibodies to the A/USSR influenza variant. In October 1978 only children, adolescents, and adults born between 1931 and 1950 had such antibodies. As there was little laboratory evidence of A/USSR infections in other age groups than among children and adolescents, we conclude that the majority of these infections must have been inapparent or generally mild.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000914:Antibodies, Viral / Q000032:analysis*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D009980:Influenza A virus / Q000276:immunology*; D007252:Influenza Vaccines / Q000276:immunology; D007251:Influenza, Human / Q000453:epidemiology / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D009664:Norway; D011159:Population Surveillance; D011897:Random Allocation
chemical_list: D000914:Antibodies, Viral; D007252:Influenza Vaccines