Figure 1

Phylogeny of four CHIKVs imported into China during 2008. The whole-genome sequences obtained in this study are indicated by black dots. Neighbor-joining trees were constructed using MEGA version 4.0 [10]; evolutionary distances were computed using the Maximum Composite Likelihood method [11] and are given as the number of base substitutions per site. All positions containing gaps and missing data were eliminated from the dataset. There were a total of 11594 positions in the final dataset.