1. pujiang town, Minhang District, Shanghai (except medium-high risk) belongs to low-risk area.

2. High-risk area: If there are no newly confirmed local cases in this area within 14 days after the last confirmed case, the blockade can be lifted. In high-risk areas, extremely strict measures should be taken to deal with the epidemic. Decisively take control measures such as suspension of work, business and classes. If necessary, regional blockade can be adopted to restrict personnel from entering and leaving. Be transferred to high-risk areas, organize a comprehensive household investigation, and promptly send those who have symptoms such as fever, dry cough, fatigue and diarrhea to designated medical institutions for investigation, diagnosis and treatment.

3. Medium-risk area: Generally, it can be unsealed in 14 days, but it depends on whether there are new cases in the closed area. If the nucleic acid test is negative within 14 days after the positive case occurs, it can be unsealed. However, in these four days, new cases have appeared one after another, and the unsealing time has to start counting again. After the closure is lifted, it will enter a 7-day transition period and adopt a 7-day home health monitoring mode. If all the nucleic acid tests are negative in the last 7 days, you will enter the stage of normalization prevention and control, and you can return to your normal life.