Figure 2. . Phylogenetic tree based on the whole genome of chikungunya virus (CHIKV). Viruses were identified by using the GenBank accession number, country code, and year of isolation. Boldface indicates strains from Cambodia; circles indicate isolates from Preah Vihear Province; triangles indicate strains from Battambang Province. Arrow indicates enlarged Indian Ocean outbreak strains. All 8 strains from Cambodia carried the A226V mutation. Numbers represent the bootstrap support obtained for respective branches (>70). The tree was rooted by o’nyong-nyong virus (GenBank accession no. AF079456, UGA96-ONNV). ECSA, East Central South African genotype. Scale bars indicate nucleotide substitutions per site.