Novel coronavirus (20 19, coronavirus pneumonia-19), referred to as "COVID-19", was named "20 19 coronavirus disease" by the World Health Organization, which refers to the pneumonia caused by novel coronavirus infection in 20 19. Since 20 19, 12, many cases of unexplained pneumonia with a history of exposure to the seafood market in South China have been found in some hospitals in Wuhan, Hubei Province, and they have been diagnosed as acute respiratory infectious diseases caused by novel coronavirus infection on 20 19.
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. The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.