Phylogenetic analyses based on VP1 nucleotide sequences of PAK NIH isolates and representative sequences of enterovirus serotypes retrieved from GenBank. The isolates characterized by VIDISCA are represented by a ‘●’ taxon marker. Prototype strains are labeled with taxon markers ‘▲’. The tree was constructed using neighbor-joining (NJ) method and Kimura 2-Parameter (K2P) model in MEGA 4.0 and evaluated with 1000 bootstrap pseudoreplicates. Bootstrap values greater than 50 are indicated at the respective nodes and the scale bar represents the evolutionary distance.