FIG 1.

Phylogenetic relationships of YYV and other alphaviruses based on alignments of structural proteins (850 amino acids) (A) and nonstructural proteins (1,287 amino acids) (B). Maximum likelihood trees were estimated using the LG plus gamma model of amino acid substitution in PhyML, with 1,000 bootstrap replicates, and rooted using salmon pancreas disease virus. Bootstrap values greater than 70% are shown beside the branches, and the GenBank accession numbers are shown with the virus names. The mosquito-specific complex is highlighted in blue with YYV in bold.