In 1982 a novel virus, subsequently named porcine circovirus (PCV), was identified by Tischer et al in 1892 (12). PVC is a DNA virus and member of the Circoviridae family. PCV infections may interfere with normal immune function (11). The first description of PMWS was in Saskatchewan in 1991 (6); this syndrome has now been described worldwide. Clinically the syndrome is characterized by wasting,...