The reason why the health code changed from green to yellow indicates that it may have been exposed to the polluted environment in COVID-19 in the past 14 days, and it needs to be isolated for seven days at this time, so the yellow code of the health code will affect children's schooling.
When the health code turns yellow, the first thing you should do is to contact the local community health service center or epidemic prevention and control center, try not to go out in the near future, keep a certain distance from your family and take your temperature twice a day. In case of any discomfort such as fever, fatigue, cough and diarrhea, you should wear a mask, go to a nearby medical institution for correction at the first time, and take the initiative to inform the doctor of the possible exposure history. The children and their families have no abnormal symptoms, and the isolation period has passed. At this time, they can re-apply for a health code, so that the yellow code of the health code becomes a green code, and then the children and their families can travel normally and the children can go to school.