Figure 1. Phylogenetic relationships among tickborne flaviviruses based on a 376-bp fragment of the ns5 gene. Distance analysis omitting third position nucleotides. Branch numbers are bootstrap confidence estimates on the basis of 500 replicates. GenBank accession numbers in parentheses. LI = Louping Ill; TBE-West = Western subtype tickborne encephalitis (Central European encephalitis); POW = Powassan virus; DTV = deer tick virus.