CIRCOVIROSIS IS NOT A DISEASE: REVIEW OF PMWS

Postweaning multisystemic wasting syndrome (PMWS) is one of the disease among the porcine circovirus diseases (PCVD). PMWS has a significant economic impact on global pig industry. Porcine circovirus type 2 has been circulating in pigs for many years before being linked to disease. PMWS has been reported from all major pig-producing countries. Infection with porcine circovirus type 2 (PCV2) is necessary for PMWS to develop, but most research has shown that PCV2 needs one or more co-factors for PMWS
to develop into severe and even fatal disease. The confirmation of PMWS should be based on certain criteria such are clinical signs (growth retardation and wasting, frequently with dyspnea and enlargement of inguinal lymph nodes and occasionally with jaundice), moderate to severe characteristic histopathological lesions in lymphoid tissues, moderate to high amounts of PCV2 within the lesions in lymphoid and other tissues and mortality in excess of expected or/and historical level for the farm. Introduction of PCV2 vaccines significantly changed the impact of PCV2 on the pig production globally.