Figure 4.

Maximum clade credibility tree of the East-Central-South African genotype of Chikungunya virus in Brazil (n = 71), including 6 new sequences from Ceará State. Tips are colored according to the source region of each sample. Clusters from the Southeast, Center-West, and North regions have been collapsed for better visualization. The 2 clusters of sequences from this study were identified as clade 1 and clade 2 based on the earliest estimated time to most recent common ancestor. A molecular clock approach was used for generating the time-rooted tree (see Methods).