Should Shiyan be isolated from Shenzhen to Loudi, Hunan?

Isolation is needed from Shiyan in Shenzhen to Loudi in Hunan. 24-hour core visual inspection does not need isolation: low-risk areas do not need isolation, only nucleic acid detection is needed. However, if it is a medium-high risk or there is no relevant announcement about the lifting of the epidemic in the local area, it is still necessary to go abroad in isolation or at home.