Taiyuan is a low-risk area at present, and there is no need for isolation, but it usually takes one month in electrician training.

1. According to the requirements of national normal epidemic prevention and control, the unsealing standards of high-risk areas are consistent, and no new cases or asymptomatic infected persons can appear in the sealed control area 14 days;

2. The last close contact person in this area has been exposed for more than 14 days, and all the nucleic acid tests are negative;

3. All personnel in this area completed the last round of nucleic acid detection two days before unsealing, and the results were all negative.