Abstract: In order to investigate the diseases associated with porcine circovirus type 2 (PCV2) infection in sows and piglets with the age of five to thirteen weeks, we detected the PCV2 antibody by indirect ELISA and viral nucleic acid by PCR from fifteen sow and twenty-nine piglet herds, respectively. The results showed that the PCV2 antidody positive rate of the fifteen sow herds was 93.3%(14/15) with fourteen positive and the other one negative, while serum antidody total positive rate was 75.3%(64/85). In the twenty-nine piglet herds, nineteen piglet herds were PCV2-positive with herd positive rate 65.5%(19/29), and in the detection of viral nucleic acid from fifty five tissue samples (spleen, lymphoid node, kidney, et al), total positive rate was up to 61.8%(34/55). It was indicated from those results that PCV2 infection was widespread in sow and piglet herds. It was showed by compairing the PCV2 antidody positive rate in sows with viral nucleic acid positive rate in piglet herds that the higher antidody positive rate in sows was, the lower viral nucleic acid positive rate in piglet herds was.

Key words: sow; piglet; porcine circovirus type 2