Can PCV2d be controlled using a PCV2a vaccine?

Porcine Circovirus 2 (PCV2) has proved to be a very variable virus, and various genotypes are known around the world, with different levels of prevalence. Ideal would be to have 1 vaccine that can protect against the majority of genotypes. PCV2 is circulating on almost all swine farms worldwide. The variability of strains evolved over time. Based on sequence identity in ORF2, PCV2 can be divided into 4 different genotypes. These PCV2 genotypes have been designated consecutively based on the tim