Guidance: It is possible. There are different management measures for people who have no records of nucleic acid testing for a certain period of time. In some areas, these people will be given gray code first, and those who have not completed nucleic acid testing for more than 12 hours in the gray code of health code will be given yellow code, while those with yellow code will be restricted from traveling in public places, so it is possible to turn yellow code if they do not do nucleic acid for a week.