The closure of the area can be lifted when the following conditions are met at the same time:

1. There are no new cases or asymptomatic infected persons in the area in the past 14 days;

2. The last close contact in the area is more than 14 days from the last exposure and the nucleic acid test is negative;

3. All persons in the region who completed a round of nucleic acid screening 2 days prior to unsealing were negative.

Control area, can be lifted when the following conditions are met at the same time:

1, no new cases or asymptomatic infections in the area in the last 14 days;

2, the last close contact in the area is more than 14 days since the last exposure, and the nucleic acid test is negative;

3, all the personnel in the area 2 days before the unsealing to complete a round of nucleic acid screening, all negative. negative.

Precautionary area, the county (district) within the sealing and control area, control area all unsealed and uncontrolled.