The Shanghai epidemic has been released. Why are those who come back from abroad still isolated in hotels?

The epidemic situation in Shanghai has been liberalized, but those who came back from abroad are still isolated because they have not been completely liberalized. According to relevant information, Shanghai officially released information that in 2023, the entry and exit management will be fully relaxed, and the entry personnel only need to be isolated for three days. Isolation is to properly arrange patients or pathogen carriers in designated isolation units and temporarily isolate them from the crowd.