Two-dimensional bar codes can be divided into two types according to the composition principle and structural shape: one is line-by-line two-dimensional bar codes. The other is matrix two-dimensional bar code, health code and so on.
Classification, meaning and grading management standard of health code. Classification of health codes: green, yellow and red. The meaning of health code and classification management standard The green code means "no abnormality" and can pass normally. The yellow code indicates the need for "investigation" or "home health monitoring". Red team said that designated medical institutions should be selected for isolation treatment or centralized isolation medical observation, and management departments at all levels should focus on strict follow-up management and take all necessary measures such as isolation, treatment and testing.