Phylogenetic trees of VP1 (A) and RdRp (B) genes of the genotype GII.2 constructed by the Bayesian MCMC method. We analyzed VP1 gene of 50 strains, and RdRp gene of 49 strains, excluding 100%—matched homologous strains. Reference strains in these trees were indicated in bold letters. Gray bar shows 95% HPD. The scale bar represents actual time (year).