Epidemiological Investigation and Analysis of Main Viral Infectious Diseases in Pigs in Liuzhou City,Guangxi from 2020 to 2023

Abstract:

In order to understand the epidemic situation and changing rule of major viral infectious diseases in pigs in Liuzhou area of Guangxi,this experiment used Realtime fluorescence RTPCR and Realtime fluorescence PCR to detect the tissue,anticoagulant and cotton swabs of slaughterhouses,freerange households and largescale pig farms in some areas of Liuzhou City from 2020 to 2023.Four pathogens of porcine reproductive and respiratory syndrome virus(PRRSV and Nsp2 15591680 mutant),classical swine fever virus(CSFV),porcine circovirus type 2 and type 3(PCV23) and porcine Seneca virus type A(SVA) were detected.The results showed that:(1)The average positive rates of HPRRSV Nsp2 15591680 mutant,PRRSV,CSFV,PCV2,PCV3 and SVAwere 0.00%(0/191),8.04%(191/2 377),0.08%(2/2 377),45.23% (992/2 193),32.74% (718/2 193) and 0.16%(2/1 239),respectively;(2)The infection rates of PRRSV,PCV2 and PCV3 were higher,and the infection rates of CSFV and SVA were sporadic.The infection rate of PCV2 decreased year by year,and the infection rates of PRRSV and PCV3 fluctuated greatly.The infection rate decreased year by year from 2020 to 2022,and the infection rate in 2023 was higher than that in 2022.(3)The positive rate of PCV2 and PCV3 in healthy pig samples was higher than that in dead pig samples in different years,while the positive rate of PRRSV in healthy pig samples was lower than that in dead pig samples in different years.PCV2 mixed with other virus infection was the main type of PCV2 double infection,and PCV2 and PCV3 infection were more serious,with an average infection rate of 15.18%.(4) The mixed infection of PRRSV,PCV2 and PCV3 was more serious in triple infection,with an average infection rate of 2.74%.The results showed that PRRSV,PCV2 and PCV3 were the main viral diseases that caused serious harm to pig herds in Liuzhou City,Guangxi,and mixed infection was more common.Epidemiological monitoring should be further strengthened,scientific and reasonable immunization procedures and plans should be formulated,and biosafety prevention and control measures at various sites should be strengthened to reduce the pollution,spread and prevalence of pathogens and promote the healthy and stable development of the pig industry in Liuzhou City,Guangxi.