辽宁省猪圆环病毒病流行特点调查分析

The Epidemic Investigation of PCVD in Liaoning Province

为了解辽宁省猪圆环病毒病(PCVD)的流行情况,在辽宁省内各地区的猪群中随机采集了1 804份样品,其中包括来自种猪场、商品代场户、散养户和屠宰场等不同猪群的血清和脏器,通过检测、结果统计进行流行病学调查分析。调查结果表明:PCV2检测样品阳性数为459份,阳性率为25.44%,样品阳性率一、三季度略高,二、四季度相对较低,没有明显的季节性规律变化。不同来源的样品中组织样品的阳性检出率(44.51%)比血清样品检出率(14.07%)高出30%,这表明PCV2隐性感染时病毒多数存在于组织样品中。全省不同地区中,辽北、辽中、辽西、辽东、辽南地区的PCV2阳性率分别为44.44%、33.56%、24.89%、22.73%、19.42%,这说明全省PCV2猪群感染率由北向南呈递减的趋势分布。

In order to explore the epidemic situation of Porcine circovirus virus disease （PCVD） in Liaoning province, 1804 samples from 14 cities in Liaoning province were tested and analyzed. The serum and tissue samples were collected from the pigs in breeding farms, fattening farms, backyard and slaughterhouses. For PCV test, PCV2 positive number is 459, the positive rate was 25.44%.PCV2 positive rate were slightly higher in the first and third quarter of the year and relatively low in second and fourth quarter of the year. There wasn＇t obvious regularity in seasonal variation. The positive detection rate of different sources of tissue samples was about 30% higher than in se- rum samples, respectively 44.51%, 14.07%, which indicated that the latent infection of PCV2 virus most present in tissue samples. The positive rate for PCV2 of the different regions in northern, middle, western, eastern, southern region of Liaoning Province were 44.44%, 33.56%, 24.89%, 22.73% and 19.42%, the result showed that the infection rate of PCV2 in Liaoning province was a decreas- ing trend from north to south.