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The phylogenetic tree was constructed with the 20 Japanese PPV3s detected from the 4 farms based on the 622 bases of the PPV3 VP gene. The 6 sequence groups were tentatively defined by the phylogenetic branch and % nucleotide difference, i.e., <0.5% (3/622) within each sequence group. The 6 sequence groups detected from the 4 pig farms are indicated. The relationship among the sequence data, the sequence group and the farm is indicated in Table 3.
