The validity period of the nucleic acid test report shall be no more than 48 hours from the time when the report is issued (issued) to the time when the test stops; The test result is negative or not detected. That is to say, the starting time of negative proof of nucleic acid test is based on the "report date" in the test report.
The health code is based on real data, which is declared by citizens on the Internet. After background review, the personal QR code can be generated. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city. The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.