潍坊市猪繁殖与呼吸综合征的流行病学调查

A SURVERY OF THE PREVALENCE OF PORCINE REPRODUCTIVE AND RESPIRATORY SYNDROME IN WEIFANG

猪繁殖与呼吸综合征是由猪繁殖与呼吸综合征病毒（Porcine reproductive and respiratory syndrome virus,PRRSV）引起的一种严重危害养猪业的传染病,主要引起妊振母猪的流产、死产、木乃伊胎、弱仔等繁殖障碍和仔猪的呼吸道疾病。本次调查采用RT-PCR对山东省潍坊市7个县20家猪场的送检样品进行PRRSV检测。结果显示,7个县猪场均检出PRRSV阳性,阳性检出率为35%~82%,平均阳性率为67.9%。流行病学调查结果表明,PRRSV感染已在潍坊市猪群中普遍存在,PRRS已成为危害当地养猪业的重要疫病。但各县市之间PRRSV感染率差异较大,在拥有较多小规模猪场的县市阳性率较高;不同日龄猪之间PRRSV感染率及死亡率差异较大,30~60日龄最高;不同品种猪群对该病毒的易感性和感染阳性率差别不大。

Porcine reproductive and respiratory syndrome （PRRS） is characterized by severe reproductive failure in sows and respiratory distress in piglets and growing pigs and continues to threat swine industry. Blood samples were collected from 20 farms of 7 counties in Weifang area and tested by RT-PCR for the presence of PRRS virus. The PRRS virus positive samples were found in all 7 counties. Among tested samples, the positive rate was 67.9% （35%-82%）. The results indicated that PRRS was prevalent in Weifang area. More positive samples were found in the counties where many small pig farms were present. The PRRS morbidity and mortality varied greatly between pigs of different ages with the highest mortality in 30-60 days old piglets. No significant difference in the susceptibility to PRRS virus and positive rate was observed in different breeds of pigs.