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Influenza B virus evolution: co-circulating lineages and comparison of evolutionary pattern with those of influenza A and C viruses



Influenza B virus evolution: co-circulating lineages and comparison of evolutionary pattern with those of influenza A and C viruses



Virology 163(1): 112-122



Sequence analyses and comparison of the genes coding for the nonstructural (NS) and hemagglutinin (HA) proteins of different influenza B viruses isolated between 1940 and 1987 reveal that the number of substitutions is not always proportional to the time between isolates. Examination of 14 influenza B virus NS gene and 10 HA gene sequences by the maximum parsimony method suggested that--as with influenza C viruses--there are multiple evolutionary lineages which can coexist for considerable periods of time. Comparison of the sequence divergence among genes of viruses belonging to type A, B, and C virus suggests that, in man, influenza B viruses evolve slower than A viruses and faster than C viruses. We propose an evolutionary model for influenza B viruses that is intermediate between the pattern for human influenza A viruses and that for influenza C viruses.

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Accession: 040438398

Download citation: RISBibTeXText

PMID: 3267218

DOI: 10.1016/0042-6822(88)90238-3


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