Epidemiological Investigation Of Pig Pseudorabies In The Southwest Of Shandong

Pseudorabies is an acute infectious disease caused by pseudorabies virus(PRV).The disease is easy to occur in pregnant sows and Suckling piglets,resulting in sudden abortion,stillbirth of sows and acute respiratory and nervous system symptoms of piglets,seriously harmful to the healthy development of pig industry.The prevention and control of pseudorabies is affected by many factors which seriously restrict the stable development of pig industry in various regions of China.For system survey to understand the current pig pseudo rabies epidemic areas in southwest shandong,including epidemic current popular activity rule,regional distribution,affecting factors and the prevention and control measures,this study analysis from the aspects of serology,etiology,factors affecting the epidemic diseases in recent years,comprehensive evaluation of pig pseudo rabies epidemic areas in southwest.The results showed that the positive rate of PRV g E antibody was 38.20% in the southwest of Shandong Province,in which the positive rate of PRV g E antibody was the highest in Cao County,the highest PCR detection rate of PRV in Shanxian County,and the lowest serological positive rate and PCR detection rate in Dingtao district.In the southwest of Shandong Province,PRV infection was significantly different in different seasons,with the highest serological(43.63%)and PCR positive rate(32.41%)in summer.The PCR detection rate of PRV in finishing pigs was 31.68%,which was significantly higher than that in sows(15.6%).The positive rate of PRV g E antibody and PRV PCR detection rate of large and retail farms were significantly lower than those of small farms.It was found that the infection rate of pseudorabies was closely related to the density of pig farms in the southwest of Shandong Province.The infection rate will be affected if pig raising scale is not matched with control instruments and equipment,daily maintenance is not timely,and biosafety measures are not carefully implemented.The positive rate of PRV g B antibody was more than 75% after vaccination in southwest Shandong province,which could provide protection for some pigs.The positive rate of PRV g B antibody in some pigs in different seasons,stages and regions was lower than 75%,indicating that the PRV g B vaccine immune system in southwest Shandong province could not provide complete protection for all pigs.