| Pseudorabies(PR)is an acute contact infectious disease with many kinds of domestic animals,that caused by pseudorabies virus(PRV)of alpha-herpes virus subfamily and herpes virus family.Swine is the main storage host and source of infection.Clinically,PRV is characterized by early abortion of pregnant sows,stillbirth and respiratory symptoms,which harmful to pig production and causes serious economic losses.PR has been one of the most important diseases restricting the development of pig industry in our province.In order to fully understand the epidemic situation and influencing factors of PR and provide epidemiological data for the prevention and control of PR in Shanxi Province,the epidemic situation of the disease in our province from the aspects of serology,etiology and factors affecting the epidemic were investigated and analyzed.The results showed that:1.From January to December 2016,clinical examination and pathological necropsy were performed on typical cases of three stages of suckling piglets,weaned piglets and finishing pigs in 122 different scale farms in Shanxi,and the clinical mortality rate of suckling piglets was high(50-100%).Weaned piglets were similar to suckling piglets,but the symptoms were mild and the mortality rate(20-50%)was relatively low;finishing pigs infected with a single swine pseudorabies usually had a mortality rate of less than 3%,but once secondary bacterial infections occur,the mortality rate would be higher.Abortion was more common in sows in the middle and later stages of pregnancy,and the mortality rate was low.In Shanxi province 18.85%pig farms had infected by pseudorabies.2.The total positive rate of gE-ELISA was 38.67%in 3412 pig serum samples.The positive rate of wild pseudorabies virus was higher in different areas of Shanxi Province,and there was significant difference in the positive rate of wild PRV in different areas(P<0.05).The positive rate of wild PRV was closely related to the season and there were a significant differences in different seasons(P<0.05).The positive rate of wild PRV in sows was the highest(45.27%),followed by suckling piglets(41.16%),fattening pigs(36.90%)and nursery pigs(30.61%).The detection rate of sows was significantly higher than that of(P<0.05)suckling piglets,fattening pigs,and nursery pigs,and there was a significant difference in the detection rate of pigs at different growth stages(P<0.05).The positive detection rate of wild PRV was the lowest in nursery pigs.The positive rate of wild PRV was related to the scale of pig farm.The positive rate of wild PRV in large pig farm was significantly different than that in retail pig farm(P<0.05),and compared with medium-sized pig farms and small-scale pig farms the difference was extremely significant(P<0.01).The positive rate of wild PRV in large pig farms was the highest,followed by retail pig farms,medium-sized pig farms and miniature pig farms.The detection rate of miniature pig farm was the lowest(25.54%).3.Through the detection of PCR on 393 pig farm samples,the total detection rate was 23.76%.The detection rate in southern Shanxi was significantly higher than that in southeastern,central and northern Shanxi(P<0.05).The detection rate in northern Shanxi area was the lowest.The detection rate showed a trend of decreasing from south to north.The detection rate of PRV in swine was the highest in summer,which was significantly(P<0.05)higher than that in autumn,winter and spring.PRV has the lowest detection rate in spring.The positive rate of PRV in fattening pigs was significantly higher than that in other pigs(P<0.05),in suckling piglets was significantly higher than that in nursery pigs(P<0.05)and in sows was the lowest.There were differences in the detection rate of PRV in pig farms with different scales.The detection rate of PRV in retail pig farms was significantly higher than that in other farms(P<0.05).The detection rate of large pig farm was the highest,and that of small pig farm was the lowest. |
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