The health code is different from the travel code. The health code is determined by each province, and its interpretation right mainly belongs to the relevant departments at the provincial level, instead of being determined by the state like tourist cards. In some provinces, health codes are not only used for epidemic prevention, but also for daily medical services. In this case, if the state forces all offline, medical services in these places may have problems.
Health code is a personal two-dimensional code based on actual real data, which is generated by citizens or people who have returned to work on their own 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.