Geographical structuring within dengue virus serotypes evident from phylogenetic (neighbor-joining tree) analysis. Asian isolates (red) and American isolates (green) are compared for serotypes 1, 2 and 3. For serotype 4, isolates from Central America (light green) are compared with isolates from South America (dark green). The unit of branch length is shown for each tree.
Behura and Severson BMC Microbiology 2013 13:37 doi:10.1186/1471-2180-13-37