DENV-4 phylogenetic tree based on the NS5 partial gene sequences. The three was constructed using the Neighbor-joining method with 1000 bootstrap replications. DENV-1 to 3 was used as outgroup. Branch lengths are proportional to percentage of divergence. Tajima-Nei nucleotide substitution model was used with a gamma distribution (shape parameter = 1). The GenBank accession numbers, species, the country of origin, and year of isolation are shown.