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J. Virol., 01 1998, 73-83, Vol 72, No. 1
G Kuno, GJ Chang, KR Tsuchiya, N Karabatsos and CB Cropp
We undertook a comprehensive phylogenetic study to establish the genetic
relationship among the viruses of the genus Flavivirus and to compare the
classification based on molecular phylogeny with the existing serologic
method. By using a combination of quantitative definitions (bootstrap
support level and the pairwise nucleotide sequence identity), the viruses
could be classified into clusters, clades, and species. Our phylogenetic
study revealed for the first time that from the putative ancestor two
branches, non-vector and vector- borne virus clusters, evolved and from the
latter cluster emerged tick- borne and mosquito-borne virus clusters.
Provided that the theory of arthropod association being an acquired trait
was correct, pairwise nucleotide sequence identity among these three
clusters provided supporting data for a possibility that the non-vector
cluster evolved first, followed by the separation of tick-borne and
mosquito-borne virus clusters in that order. Clades established in our
study correlated significantly with existing antigenic complexes. We also
resolved many of the past taxonomic problems by establishing phylogenetic
relationships of the antigenically unclassified viruses with the
well-established viruses and by identifying synonymous viruses.
Phylogeny of the genus Flavivirus
Division of Vector-Borne Infectious Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Fort Collins, Colorado 80522-2087, USA. GOK1@CDC.GOV
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