Fig. 1

Phylogenetic analysis of complete VP2 gene sequences of CPV-2 strains circulating in Kunshan. The evolutionary history was inferred by using the maximum likelihood method and the Tamura–Nei model with 1,000 bootstrap replicates via MEGA 11 software. The present study CPV-2c genotypes are indicated by ‘‘red circles’’ followed by their accession number, genotype, location, and detection year. CPV-2 reference strains representing known genotypes (CPV-2a, CPV-2b and CPV-2c) were retrieved from GenBank and included in the tree