Hunan does nucleic acid scanning Hunan health code.

Hunan health codes are divided into red codes, yellow codes and green codes. The red code indicates that the risk of Covid-19 infection is high; The yellow code suggests that the risk of Covid-19 infection does not necessarily mean that it will be infected; The green code does not mean that there is no risk of infection.

In addition, in order to find the epidemic situation as early as possible, some people with green codes who may be at risk of infection but have low risk will take the health code pop-up window to remind them to carry out nucleic acid testing and self-health monitoring according to regulations.

There are three main reasons for code change:

First, cross-provincial or cross-regional activities, after leaving the epidemic area, high, medium and low-risk key areas, big data will be generated and pushed to the next destination, and the data push may be later than the flow of people.

Second, the data sources of health codes, mainly the big data pushed by relevant departments and the results of epidemiological investigation, will be pushed to the next destination after the outbreak or after the delineation of high, medium and low risk areas, so there is a delay in assigning codes.

thirdly, at the time of departure, the epidemic situation has not been found or the middle and high risk areas have not been delineated. After the discovery of the epidemic, through research and judgment, the possible starting time of the epidemic will be calculated forward, resulting in people who left the area in the past for a period of time being assigned codes as risk personnel.