1. Individuals should check whether they have been to high-risk areas in the last 14 days, whether they have been to cities with local cases (except Changsha), and whether they overlap with the published confirmed cases or the activity tracks of asymptomatic infected people. 2. Take the initiative to report to the individual for self-examination. In case of the above situation, please take the initiative to report to the village (community) at the first time and cooperate with the implementation of epidemic control measures. When the control is over, it will turn into a green code. If this is not the case, it is necessary to complete the nucleic acid detection of 1. 3. If the health code does not turn green after implementing control measures (including management time limit and nucleic acid detection times), wait 1-2 days. If the health code still does not turn green, apply for decoding according to the decoding process: 1. Contact your local village (community) (attach specific contact information). 2. Prepare materials according to the requirements of the village (community). ①-④ It must include health code, travel code (small print below is 14 day arrival or route), negative results of nucleic acid test for corresponding times (at least 24 hours between times), commitment letter for decoding application, change of refund record and other supporting materials. 3 people who have not gone out shall be issued with relevant certificates by the village (neighborhood) Committee, work unit or school where they live. 4. The village (community) declares that the village (community) will collate the data and report it to the special mailbox of Wangcheng District CDC. 5. After receiving the data, the CDC in the audit and decoding area conducts audit and decoding, and the decoding time is about 1-2 days. The decoding situation will be replied to the village (community) by email.