The yellow code is mainly generated for the following categories of personnel:
1. People with abnormal state of supervision in healthy state, such as those with respiratory symptoms such as fever and shortness of breath.
2. Returnees from other places need to be quarantined at home for 14 days, except for returnees from key epidemic areas.
3. Other personnel who need to be included in the yellow code management. It does have the corresponding symptoms and turns into a yellow code. Symptoms disappear, their own crisis is relieved, and they are in good health. After being confirmed by local authoritative hospitals, they can be converted into green codes.