Genetic relationship between the HA genes of type A influenza viruses isolated in off-seasons and later epidemic seasons
Identifieur interne : 002025 ( Main/Exploration ); précédent : 002024; suivant : 002026Genetic relationship between the HA genes of type A influenza viruses isolated in off-seasons and later epidemic seasons
Auteurs : S. Nakajima [Japon] ; K. Nakamura [Japon] ; F. Nishikawa [Japon] ; K. Nakajima [Japon]Source :
- Epidemiology and Infection [ 0950-2688 ] ; 1991-04.
Abstract
From January 1985 to March 1989, off-season viruses of H1N1 and H3N2 subtypes of influenza A viruses were isolated on five occasions in Japan. The HA gene sequences of the influenza A(H1N1) and A(H3N2) viruses isolated in Japan from 1985–9 were analysed and the phylogenetic tree for each subtype virus was constructed to determine any genetic relationship between viruses isolated in off-seasons and the epidemic viruses of the following influenza seasons. In one instance with H1N1 viruses in 1986 and in two instances with H3N2 viruses in 1985 and 1987, the spring isolates were genetically close to some of the winter isolates and were considered to be the parental viruses of the following influenza seasons. However, even in these cases, influenza viruses of the same subtype with different lineages co-circulated in Japan.
Url:
- https://api.istex.fr/ark:/67375/6GQ-J87MBMKB-Q/fulltext.pdf
- http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2272002
DOI: 10.1017/S0950268800048536
Affiliations:
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Le document en format XML
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<front><div type="abstract">From January 1985 to March 1989, off-season viruses of H1N1 and H3N2 subtypes of influenza A viruses were isolated on five occasions in Japan. The HA gene sequences of the influenza A(H1N1) and A(H3N2) viruses isolated in Japan from 1985–9 were analysed and the phylogenetic tree for each subtype virus was constructed to determine any genetic relationship between viruses isolated in off-seasons and the epidemic viruses of the following influenza seasons. In one instance with H1N1 viruses in 1986 and in two instances with H3N2 viruses in 1985 and 1987, the spring isolates were genetically close to some of the winter isolates and were considered to be the parental viruses of the following influenza seasons. However, even in these cases, influenza viruses of the same subtype with different lineages co-circulated in Japan.</div>
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