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Phylogenetic analysis of VP1 gene of echovirus. The dendrogram of the 16 E30 outbreak strains and 30 reference strains from GenBank is based on the sequence of 876 nucleotides (nt 2460 to 3335) of the VP1 gene and was obtained by the neighbor-joining method with the DNADIST distance measure program (version 3.573c; PHYLIP). The percent bootstrap frequency of each branch in the tree is indicated. Enterovirus 21 was included as an outgroup.
