Should Shanghai be isolated from Changsha?

Shanghai to Changsha should not be isolated.

Changsha's epidemic prevention policy: All migrant (returning) workers hold negative nucleic acid test certificates within 48 hours, actively cooperate with the first port of entry for nucleic acid test (1 day) after arrival, and do 1 nucleic acid test on the third day after arrival to do a good job in health monitoring. Don't go to parties, public places and public transportation until the results of nucleic acid test come out on the third day.