Change it every three weeks, neither too long nor too short.
For medical personnel who enter the isolation area, residence management in different areas should be realized. At the end of the day's work, the staff of the isolation point are not allowed to go out without permission, but they can live and rest in the clean area of the isolation hotel, and the staff do not touch each other unless necessary. All staff should do daily health monitoring and regular nucleic acid detection, and must complete the whole process of vaccination. After the evacuation of the personnel who finally finished the work at the isolation point, carry out home health management as required.