Phylogenetic tree of the TBEV isolates from Canton Valais. The sequences of the TBEV isolates were based on concatenation of the NS5 gene (212 bp) and the envelope gene (752 bp). The Omsk hemorrhagic fever virus was used as an out-group to root the tree. The TBEV sequences from Canton Valais are shown in bold. GenBank accession numbers are indicated and bootstrap values ≥ 80% are shown. The scale bar corresponds to 0.04 nucleotides per site.