Three nucleic acid tests should be conducted within 7 days. If the result is negative, you can apply to the community to cancel the yellow code. /kloc-within 0/4 days, you can pass in order with the effective nucleic acid detection within 7 days. However, it is still necessary to avoid participating in gathering activities and going to crowded areas such as public places, and go to designated nucleic acid testing places on the premise of full protection.