Fig. 1.

Maximum clade credibility (MCC) tree constructed using 11,236 bp nucleotide sequence of each 126 CHIKV strain represented as cladogram. The four major lineages were highlighted with different branch colors, while numbers adjacent to the branches indicate Bayesian posterior probability values. The estimated 95% HPD values of four major lineages were labeled beside the nodes in bracket. For clarity, the Asian and west African lineages are represented as collapsed nodes. Strains are labeled as GenBank accession number, location and date (year) of collection