Phylogenetic analysis based on the full coding sequences of Chaoyang Virus (CV) together with arthropod-borne flaviviruses and flaviviruses with not known vectors. Phylogenetic analyses were performed by the neighbor-joining method with MEGA software http://www.megasoftware.net/. Bootstrap probabilities of each node were calculated with 1,000 replicates. Scale bars indicate a genetic distance of 0.05-nt substitutions per site. Note that the Chinese CV strains designated by boldface type in red are clustered in the mosquito-borne group and have been separated into an independent evolutionary clade.