Francisco Rivera

1. IntroductionPorcine circovirus type 2 (PCV2) belongs to the genus Circovirus within the family Circoviridae. It is a small, non-enveloped virus containing a circular single-stranded DNA genome of approximately 1.7 kb. To date, nine PCV2 genotypes, designated PCV2a to PCV2i, have been described worldwide. The genotype distribution of PCV2 has changed over time: PCV2a was initially the most commo ...