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Phylogenetic relationship between WNV isolates. A MCC phylogeny constructed from the open reading frame of 196 WNV isolates is shown. Nodes with >0.9 posterior probability are indicated by filled circles. Isolates from California are highlighted in gray. The two emergent genotypes of WNV are indicated on the phylogeny by color: WN02 in blue lines and SW03 in orange lines.
