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Phylogenetic relationships of dengue virus in Bangkok, Thailand, sampled from 1973–2001. All four DENV serotypes are shown. Major genotypes and clades within genotypes are indicated, as are the range of sampling times within in each group. The phylogenetic events in DENV-1, DENV-2, and DENV-3 that coincide with the changing prevalence of DENV-4, particularly clade turnover, are indicated by arrows. All horizontal branch lengths are drawn to scale.
