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Background:Porcine circovirus type 2 (PCV2) is associated with post-weaning multisystemic wasting syndrome (PMWS) in pigs.Currently,there is considerable interest in the immunology of PCV2,in particular the immunological properties of the capsid protein.This protein is involved in PCV2 immunogenicity,may play a role in viral immunosuppression and is a potential target for vaccine development.