title: Virological study of some influenza outbreaks in the period January--March 1975.
abstract: The virological study of some influenza outbreaks recorded in Romania in the period Jnauary--March 1975 resulted in the isolation of 29 influenza A2 virus strains antigenically close to the strains A2/Port Chalmers 1/73 and A2/England 42/72. The non-homogeneous antigenic structure of the isolates suggests the possible formation of natural hybrids.
mesh_terms: D000956:Antigens, Viral / Q000032:analysis; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D009980:Influenza A virus / Q000302:isolation & purification*; D007251:Influenza, Human / Q000453:epidemiology*; D009975:Orthomyxoviridae / Q000302:isolation & purification*; D012383:Romania
chemical_list: D000956:Antigens, Viral