Generally, those who need to be isolated for 2 1 day are in high and medium risk areas. Because the influxes from high and medium risk areas were concentrated (or isolated at home) 1 day, 3-5 days and 13 days, respectively, 1 nucleic acid detection was carried out. On the 20th day of isolation, 1 nucleic acid was detected for the influxes in high-risk areas. Upon the expiration of the quarantine period, if the test result is negative and there are no suspicious symptoms, the quarantine can be lifted.

For those who have arrived at their place of residence between/0/4 days before the first case is diagnosed and the risk level modulation day, if it has reached 7 days, arrange two nucleic acid tests (24 hours apart); Less than 7 days, arrange 3 nucleic acid tests (24 hours apart).