Is Tianjin digital epidemic prevention QR code always valid?

It always works. Tianjin digital epidemic prevention QR code can be divided into green code, orange code and red code. The green code is a health code, so you can travel and return to work normally. Code orange personnel should strictly implement the requirements of home medical observation and consciously accept community management. Red team personnel are strictly controlled by relevant institutions and communities. Tianjin digital epidemic prevention QR code has been effective and easy to manage.