Abstract: In order to investigate antibody levels of porcine reproductive and respiratory syndrome virus (PRRSV) and porcine circovirus type 2 (PCV2) in porcine serum, we randomly collected from different sizes of farms in southern regions of Henan province, these pigs had or had not been vaccinated with PRRS and PCVD vaccine. The antibody levels of PRRSV and PCV2 were detected by ELISA in this article. The results showed that average qualification rates of antibodies of PRRSV and PCV2 were 68.8% and 58.7% in vaccinated farms,respectively,the larger farm, the higher qualified rate, which 200 to 500 sow pigs farm was the highest (76.8% and 77.4%,respectively) and under 50 sow pigs farm was the lowest (48.3% and 44.2%, respectively), which sow pig was highest and finishing pig was lowest. The results showed that average positive rates of PRRSV and PCV2 antibodie were 55.6% and 65.3% in no vaccinated farm, respectively, which average positive rate of PRRSV antibody in 100 to 200 sow pigs farm was lowest (46.5%), under 50 sow pigs farm was highest (68.8%), and growing pig and finishing pig were both more than 71%, which average positive rate of PCV2 antibody, the larger farm, the lower positive rate, 200 to 500 sow pigs farm was 41.4%, 50 to 100 sow pigs farm and under 50 sow pigs farm were 78.6% and 78.9%,respectively, and female and male sow pigs were lowest (37.5% and 40.4%,respectively), and growing pig and finishing pig were higher (82.2% and 79.5%, respectively). This research reflected the situation and the rule of the antibody levels of PRRSV and PCV2, these pigs had or not been vaccinated with PRRS and PCVD vaccine, and provided theoretical bases and guidances for prevention and control of PRRS and PCVD in southern regions of Henan province.

Key words: southern region of Henan province; porcine reproductive and respiration syndrome; porcine circovirus disease; antibody detection