1, red team and yellow code are the abbreviations of the phenomenon that health codes are red and yellow in epidemic prevention work in COVID-19. Health pass codes are divided into three colors: red, yellow and green. According to the regulations, "code red" and "code yellow" personnel cannot pass, and medical treatment or observation should be carried out according to the requirements of the epidemic prevention and control department; "Green code" personnel with normal body temperature can pass.

2. The health code is based on actual data, which can be generated by citizens or people who have returned to work through online declaration and background audit. 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.