Figure 1
From: Molecular epidemiology of dengue viruses in southern China from 1978 to 2006
Neighbor-joining phylogenetic trees of 145 E gene sequences were conducted using Mega3.1 with the Kimura-2 parameter corrections of multiple substitutions. Bootstrap values (in percentage >65%) on each node were generated by using 1000 replications. The branch lengths are proportional to the number of nucleotide changes. All the Chinese isolates are in bold for clarity. A: phylogenetic tree of serotype DENV-1, DENV-2 and DENV-4 virus; B: phylogenetic tree of the DENV-1 isolates; C: phylogenetic tree of the DENV-2 isolates; D: phylogenetic tree of the DENV-4 isolates.