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Unrooted consensus NJ tree using 1,000 bootstrap replicates constructed from the VP1 gene region from 45 whole-genome sequences and the reference strains. The six phylogenetic clustering patterns were reproduced by the VP1 gene. No distinct subgroup Ib cluster was identified. JL clustered with subtype V strains, and WW and Dik clustered with subtype VI. Strain notations and origins are described in Table 1.
