RESUMO
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.
Assuntos
Vírus da Influenza A/isolamento & purificação , Influenza Humana/epidemiologia , Orthomyxoviridae/isolamento & purificação , Antígenos Virais/análise , Testes de Inibição da Hemaglutinação , Humanos , RomêniaRESUMO
Influenza vaccinations were performed either by administration of a bivalent A2 + B vaccine, or by successive application of monovalent B and A2 vaccines. During an influenza epidemic caused by an A2 strain, the following observations could be made: a) the best efficiency (no influenza cases) was recorded in adults and aged persons (over 65 years) irrespective of the vaccination scheme; b) in schoolchildren the best results (no influenza cases) were obtained in the lot having received monovalent A2 vaccine, and in the lot vaccinated nasally with monovalent B vaccine and 14 days later with monovalent A vaccine.