An Overview of Evolution Concerning Natural Attenuated Strains of ASFV
The outbreak of African swine fever(ASF)has been effectively controlled since African swine fever virus(ASFV)was introduced into China in 2018. But its prevalence has changed since 2021,that is,“natural variants”are clinically emerging. The strains may cause atypical clinical symptoms,and could be confused with other animal diseases. All of which is consistent with the evolution rule in other countries,that is,when ASF is prevalent in a country or region for a long time,its clinical symptoms will transfer from acute morbidity to slow occurrence or new symptoms are emerging. The prevalence rule of the virus,especially the natural attenuated strains,has been largely documented in other countries,except China. Therefore,the evolution process of the natural attenuated strains was summarized in the paper,and some suggestions were hereby put forward,such as further developing serological diagnosis products,speeding up the approval process for industrialization as well as carrying out serological surveillance and tracing as appropriate,with a view to providing some references for scientific prevention and control of ASF in China.