Figure 6
From: Porcine circovirus type 2 (PCV2): genetic variation and newly emerging genotypes in China
Phylogenetic analysis of the 19 PCV2 isolates. The phylogenetic tree was constructed using MEGA 4 software after alignment of the full-length sequences. The PCV2 genomes were mainly assigned to three genotypes (PCV2a, PCV2b and PCV2d). PCV2b was subdivided into two clusters and PCV2d represented a newly emerging genotype in China. The percentage of strains in each genotype or cluster is indicated at the corresponding positions. The results showed that the PCV2b genotype of PCV2 is predominant in China, which was compatible with reports of a shift from PCV2a to PCV2b.