陕西省榆林市猪伪狂犬病流行病学调查与净化示范
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S851.3

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榆林市科协青年人才托举计划项目(20210332)


Epidemiological Investigation and Purification Demonstration of Porcine Pseudorabies in Yulin City,Shaanxi Province
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    摘要:

    为系统评估榆林市猪伪狂犬病(PR)防控成效,2014—2015年采用问卷调查与采样检测相结合的方法,对榆林市猪伪狂犬病病毒(PRV)疫苗免疫及感染情况进行了调查。结果显示:榆林市散养户基本不进行PRV疫苗免疫,PRV-gE抗体阳性率高达47.50%;规模猪场中免疫场占比仅为43.94%,PRV-gE抗体阳性率为15.40%;用PRV gE基因缺失疫苗免疫过的猪群中依然能检测到PRV-gE抗体,gE抗体阳性率为8.46%,且仔猪和育肥猪群中gE抗体阳性率较高,分别为34.36%和20.95%。结果表明,2014—2015年榆林市的PRV疫苗免疫效果较差,野毒感染较为严重。为探索科学的PR净化方案,2016—2020年选取能真实反映榆林市平均流行水平的某县进行PR净化示范建设,通过临床调查、实验室检测,划分场群类型,分类实施不同净化和免疫方案,取得了较好的净化效果。至2020年,规模场PRV-gE抗体阳性全部降为0,平均免疫抗体(gB抗体)阳性率达到90%;散养户PRV-gE平均抗体阳性降为3.20%,gB抗体阳性率达到75.00%;产死胎、木乃伊胎及弱仔数与净化前相比下降90%以上。结果表明,该县的PR净化示范工作取得了成功,净化经验可向全市推广,以最终实现全市PR净化目标。

    Abstract:

    In order to systematically evaluate the effectiveness of prevention and control of porcine pseudorabies(PR)in Yulin City,from 2014 to 2015,the vaccination and infection of PR in the city were investigated by a questionnaire in combination with sampling detection. The results showed that no vaccination against porcine pseudorabies virus(PRV)was implemented by free-range households in general,and the positive rate of PRV-gE antibody was 47.50%;for intensive farms,those with vaccination accounted for 43.94%,and the positive rate of PRV-gE antibody was 15.40%;PRV-gE antibody could still be detected in pigs vaccinated with PRV gE gene deletion vaccines,with a positive rate of 8.46%,and the positive rates of PRV-gE antibody were higher in piglets and fattening pigs,up to 34.36% and 20.95% respectively. In conclusion,the immunization produced by PRV vaccine was poor in the period in the city,and infection with field viruses was serious. In order to develop a scientific PR purification plan,from 2016 to 2020,a county where the average prevalence level of the city could be truly reflected was selected to study the construction of PR purification demonstration. The farm tupes were classified through clinical investigation and laboratory test,and different purification and immunization programs were implemented,which achieved good purification effects. By 2020,the positive rate of PRV-gE antibody was reduced to 0 in all intensive farms where the average positive rate of immune antibody(gB antibody)reached 90%;the average positive rate of PRV gE antibody decreased to 3.20% in free-range households where the positive rate of gB antibody was up to 75.00%;and the number of stillbirths,mummified or weak fetuses decreased by above 90% compared to that prior to purification. It was concluded that the demonstration of PR purification was successful in the county,from which its experience might be popularized to other regions to reach the final goal of PR purification across the city.

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韩斌,高艳,贾燕青,白崇生,薛九州.陕西省榆林市猪伪狂犬病流行病学调查与净化示范[J].《中国动物检疫》编辑部,2022,39(8):26-30.

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