Because Shanghai Jiading District is currently a high-risk area as judged by the current published risk areas, going to Shanghai Jiading District will carry a star.

Through the color of the health code, you can quickly identify whether a person is the pathway to the provinces and cities where the epidemic is more serious, and whether he or she has directly or indirectly contacted infected patients, and then through the analysis of big data, you can directly lock and find the people who may be infected.