The yellow code encoded by big data, if it meets the requirements of nucleic acid detection, will generally change back to green code after 3 days. If you can't change the green code in time, you can consult the local community or CDC about transcoding.
Please report to the local community (village) or county CDC immediately, and actively cooperate with the epidemiological investigation and follow-up epidemic prevention measures. If you have symptoms such as fever, cough, diarrhea, fatigue, and decreased sense of smell (taste), please wear a disposable medical surgical mask, go to a medical institution in time, and take the initiative to inform the doctor of his residence and contact history in the past 7 days. Go out for medical treatment and avoid taking public transport.
Red team has three main reasons:
First, cross-provincial or cross-regional activities. After leaving epidemic areas, high schools, low-risk and other key areas, big data will be generated and pushed to the next destination, which may be later than the flow of people.
The second is the data source of health code, mainly the big data and epidemiological survey results pushed by relevant departments. These data 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.
Third, no epidemic situation was found at the time of departure or no medium and high risk areas were delineated. After the epidemic was discovered, the possible start time of the epidemic was calculated forward through research and judgment, resulting in people who left the area in the past period of time being assigned as risk personnel.