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Phylogenetic tree based on the nucleotide sequence of the VP1/2A region (nt 3024 to 3191). Letters corresponding to the same groups as those depicted in Fig. 2 and 3 are shown in parentheses. Symbols: asterisk, samples with a valine-to-isoleucine change at position 72 of protein VP3; dagger, samples with a valine-to-alanine change at position 63 of protein VP0; double dagger, samples with a methionine-to-valine change at position 28 of protein VP1.
