Figure 7. Phylogenetic tree based on the cap gene sequences of PCV3 obtained from GenBank database and three sequences detected in this study.

The phylogenetic tree was based on the partial capsid gene sequences. The phylogenetic tree was constructed using the p-distance-based neighbor-joining method in MEGA 6.0 software. Bootstrap values were calculated with 1,000 replicates. Black solid circles indicate the strains from Tianjin. Black solid squares indicate the strains from the United States. Scale bars indicate nucleotide substitutions per site.