2009年我国猪群中猪圆环病毒2型感染情况调查

为了解我国猪群中猪圆环病毒2型（Porcine circovirustype2，PCV2）的感染情况，分析感染与猪年龄的关系，本试验于2009年在我国28个省市的71个中小规模场、22个屠宰场和62家散养户采集了2905份猪血清样品，用PCR法对PCV2进行检测。结果显示，检出阳性血清429份，阳性率为14．8％。在被调查的场／P中，86．4％屠宰场、52．1％中小规模场和58．1％散养户为PCV2感染阳性，其中48．6％的PCV2阳性中小规模场的群阳性率低于10％。分析中小规模场PCV2感染情况和猪年龄之间的关系发现，在5个年龄组中，2～4周龄组未检出PCV2感染，5周龄以上各组均检出PCV2感染，其中11～14周龄组和15～26周龄组阳性率较高，高于5～7周龄组和8～10周龄组。

Investigation of porcine circovirus type 2 infection in mainland China

In order to understand porcine circovirus type 2 （PCV2） infection in Chinese pig population and analyze the relationship between the PCV2 infection and pig age,a total of 2 905 serum samples were detected for PCV2 by PCR method,which were collected from 71 small to medium scale farms,22 slaughter houses and 62 backyard farms in 28 provinces of mainland China in 2009. The results showed that 429 positive serum samples were found,and the aver- age positive rate was 14. 8~. The positive farm rate of slaughter houses, scale farms and backyard farms were 86.4%, 52.1% and 58.1%, respectively, and the infection rate of 48.6 % positive scale farms was less than 10%. To analyze the correlation between the PCV2 infection and pig age, the pigs of scale farms were divided into five age groups. The results showed that PCV2 infection was not detected in 2-4 week group, but in all other groups. The positive rate of 11-14 weeks group and 15-26 weeks group was higher than 5-7 weeks group and 8-10 weeks group. This work investigated the PCV2 infection in most Chinese provinces and explored the relationship between the PCV2 infection and pig age,and it provided valuable data for controlling the possible risk of PCV2 infection for the Chinese pig industry.