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Evolutionary relationships of DEN-1 Colombian isolates. The evolutionary history was inferred using the Maximum Likelihood method. The optimal tree with the sum of branch length = 0.20353432 is shown. The confidence probability of each node was estimated using the bootstrap test (1000 replicates) and values over 50% are presented. The tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree. The evolutionary distances were computed using the Maximum Likelihood method and are in the units of the number of base substitutions per site. Square brackets indicate putative lineages 1 and 2. Phylogenetic analyses were conducted in PAUP*