Figure 2.

Phylogenetic tree of PEDV based on complete S gene. The best-fit model and the shape parameter of the gamma distribution (alpha) for the tree are indicated in the upper-left side. The numbers at a node are posterior probability values estimated. All different genogroups are denoted; the different clades CI and CII previously described by Vlasova et al. [28] into the genogroup 2a are also denoted. The sequence of PEDV/Cotopaxi/2014 is highlighted in red. Blue rectangles denote PEDV strains previously classified as 2a in Zhang et al. [31] (see Figure  1B in Zhang et al. [31]; the strains were clearly grouped into genogroup 2b but were denoted as 2a). The US INDEL sequences were also denoted.