Fig. 1

Phylogenetic analysis of CV-A6 complete VP4 nucleotide sequences phylogenetic analysis was performed and the tree was constructed using the neighbor-joining algorithm implemented in the MEGA version 5.0 software program with 1000 bootstrap pseudoreplicates. The numbers on the branches indicate the bootstrap values, excluding those <70 % for clarity. CV-A16 (accession no. KM382148.1) was used as an outgroup control. Black dots show CV-A6 strains isolated in this study. GenBank numbers of reference sequences are shown. a Phylogenetic analysis of the most reference strains of CV-A6. b Phylogenetic analysis of the subtree A1