The Serological Investigation And Assessment Of Infection Pressure Of PRRS In Jiangxi Province In 2017

In recent years,swine diseases has become more and more complex,mainly mixed infection and secondary infection.In the pig farms of Jiangxi porcine reproductive and respiratory syndrome(PRRS)is a common disease.It is difficult to observe the typical characteristics of the disease,which led to the difficulty for diagnose only according to the clinical symptoms.In this paper,serological investigation of porcine reproductive and respiratory syndrome in Jiangxi Province in 2017 is carried out by ELISA antibody tests.On this basis,the infected pig farms were selected by disease early warning and infection pressure assessment,and the diagnosis and treatment of PRRS were studied by medical care and vaccination.The results are as follows:1、Serological investigation of PRRS in Jiangxi province in 2017In 2017,a total of 4394 serum samples of pigs from different stages of 144 pig farms in eastern Jiangxi,northern Jiangxi,western Jiangxi,southern Jiangxi and central Jiangxi were collected.Blood samples are widely distributed,which have strong representative.In2017,the total positive rate of antibody against porcine reproductive and respiratory syndrome virus was 80.7%.The positive rate of antibody in different seasons and stages fluctuated a little.2、PRRS early warning and infection pressure assessmentFarm A: the proportion of PRRSV antibody S/P>2.0 is 85%,which is too high.If the basic pigs are introduced directly,there is a risk of virus dispersal.It may cause abortion of multiparous sows,or outbreak of respiratory diseases of piglets and fattening pigs.The back-up sows were domesticated by two times of vaccine.A back-up sow from S/P >2.0was kicked out after detected one by one.With a strict control of infected pigs into the group,the production of piggery did not fluctuate.3、The application of serological detection in the diagnosis and treatment of PRRS in pig farmsFarm B: in January 2017,the sows appeared unexplained abortion.After the medical care and vaccination,the proportion of PRRSV antibody S/P>2.5 decreased from 34.8% to15.5%,and the positive rate of PRRSV increased to 100% in all the other stages.After April 2017,until so far the condition shows no sign of sow abortion in farm B.