Medical observation was carried out for 7 days for those who lived in high-risk areas and returned to Mao in recent 7 days, and nucleic acid detection was carried out for 1, 2, 3, 5 and 7 days in centralized isolation. Those who lived in the middle risk area for the last 7 days were observed at home for 7 days, and their nucleic acids were detected at 1, 4 and 7 days respectively. The management period starts from leaving the risk area.
For those who live in low-risk areas in the last 7 days, complete nucleic acid detection twice within 3 days and do a good job in health monitoring. If isolation measures have been implemented in the local area, and the local certificate of lifting isolation and the negative certificate of nucleic acid detection within 48 hours can be issued, the "four ones" health management will be implemented after hair return.