RESUMO
Influenza A/duck/Aralsk/1/78 virus was isolated from ducks in southwestern Kazakhstan. Typing of this virus neuraminidase indicated its appurtenance to the 2nd avian type. Hemagglutinin of A/duck/Aralsk/1/78 virus typed by the HI test showed no relationship with any one of the strains used in the test including H0, H1, H2, H3, Hsw1, Heq1, Heq2, viruses and strains with all 10 avian hemagglutinins. This suggests that hemagglutinin of A/duck/Aralsk/1/78 virus (Hav?Nav2) belongs to a new, hitherto unknown type.
Assuntos
Patos/microbiologia , Vírus da Influenza A/isolamento & purificação , Animais , Embrião de Galinha , Vírus da Influenza A/classificação , Vírus da Influenza A/enzimologia , Cazaquistão , Neuraminidase/classificação , SorotipagemRESUMO
Influenza A virus with the antigenic formulae Hav4Neq2 has been isolated from Chlidonias nigra in the region of mass moulting in the territory of the Kazakh SSR. Antihemagglutinins for the newly isolated virus were detected in the sera of some specimens of the sea gull order. The data obtained suggest an active circulation of the virus in this region during the summer of 1977.
Assuntos
Grupos de População Animal/microbiologia , Animais Selvagens/microbiologia , Aves/microbiologia , Vírus da Influenza A/isolamento & purificação , Animais , Anticorpos Antivirais/análise , Testes de Inibição da Hemaglutinação , Vírus da Influenza A/classificação , Cazaquistão , Microscopia Eletrônica , Testes de Neutralização , Infecções por Orthomyxoviridae/epidemiologia , Infecções por Orthomyxoviridae/veterinária , SorotipagemRESUMO
Examinations for the presence of antihemagglutinins to influenza A(H3N2), A(H1N1) and B virus strains in the sera from people of different ages collected in April-May and October-November, 1977, showed that influenza A(H1N1) virus began to circulate in the human population of Moscow before the onset of an overt epidemic, in the period between June and October, 1977. This conclusion has been drawn on the basis of the absence of antihemagglutinins to A(H1N1) virus in the sera from subjects of 16-20 years late in April and their detection in 25.9% of those examined on November 23, 1977. The lack of antibody both to the old A/FM/1/47 (H1N1) and a new A/USSR/90/77 (H1N1) strains of influenza A (H1N1) virus in this age group in April indirectly attests to the fact that influenza A virus of this subtype has not circulated among the population in the last 20 years. At the same time the observed significant (by 1.5-2.0 log2) rise in the geometric mean titers of antibody to A(H3N2) virus in May-October indicates its continued active circulation among the population in this period. Thermostable inhibitors of influenza A/USSR/90/77 (H1N1) virus in human sera may be most effectively removed by treatment of the sera with potassium periodate or RDE.
Assuntos
Anticorpos Antivirais/análise , Vírus da Influenza A Subtipo H1N1 , Vírus da Influenza A Subtipo H3N2 , Vírus da Influenza A/imunologia , Orthomyxoviridae/imunologia , Adolescente , Adulto , Anticorpos Anti-Idiotípicos/análise , Antivirais/isolamento & purificação , Criança , Pré-Escolar , Humanos , Lactente , Pessoa de Meia-Idade , Moscou , Estações do AnoRESUMO
Two virus strains identified as paramyxoviruses have been first isolated in the Premorskiy region from Larus crassirostris feeding on food wastes from a fur farm.