Figure 4.

Minimal evolutionary tree of DENV-2 derived from the C₉₁-prM₁ gene. Branch lengths are proportional to percentage divergence. For distance/neighbor joining, maximum likelihood and Tamura Nei analyses, 1000 bootstrap replications were performed with MEGA 4.0 [55]. The percentage of replications supporting each branch, by parsimony analysis with gaps included, appears below the relevant branch. Oaxaca isolates appear in bold in the Asian/American genotype cluster. DENV-1, 3 and 4 were used as outgroups.