(1) Cell phone signal According to your roaming record, it is found that you have been active or passed through the "dangerous area".
② The number of trains, flights and residential quarters you took; ③/kloc-people with abnormal data within 4 days.
④ Isolation is less than 14 days.
⑤ There are "bad records" in the hospital, such as cough and fever.
Simply put, the yellow code is to remind you to report to the community and do nucleic acid. It may be that there are risks in your area or the area you have been to. Don't worry too much. When the risk level of the relevant area decreases or the latest nucleic acid information is updated, the health code will be restored to the original state.