The difference between the modulation codes of Beijing Health Treasure tourism code stream.

Both are QR codes needed for prevention and control.

Flow code is the abbreviation of epidemiological investigation and the key to epidemic control. The information collected by epidemiological investigation can play a key role in effectively curbing the epidemic.

Health codes are based on actual data and 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.