Seroprevalences of Classical Swine Fever Virus and Porcine Reproductive and Respiratory Syndrome Virus in Pigs in Hunan Province, China

Abstract

Background: Several infectious diseases including classical swine fever (CSF) and porcine reproductive and respiratory syndrome (PRRS) are responsible for major economic losses and represent a threat to the swine industry worldwide. Hunan is a province in south-central China, serological statistics will have certain effect on local breeding industry.The present study investigated the seroprevalences of classical swine fever virus (CSFV) and porcine reproductive and respiratory syndrome virus (PRRSV) in pigs from eight cities of Hunan province from 2017 to 2019. The samples were divided into two groups based on whether the hosts were immunized or not, and analysed by enzyme-linked immunosorbent assay (ELISA).Results: The seropositivity of CSFV and PRRSV between different parts of Hunan province in China was statistically significant. In unvaccinated group, our findings showed CSFV antibody in piglets' sera decreases gradually with increase of piglets' age whereas PRRSV-specific antibodies may appear in various growth stages. In immunized group, the average seropositive rate of CSFV antibody was 82.2%, while the rate of PRRSV antibody was relatively higher (84.4%).Conclusions: Results from this study suggested that a serological investigation on these two major infectious diseases (CSF and PRRS) among various growth stages of pigs will provide a basis for further development of more effective preventions and control measures.