Nucleic acid testing can be done after a positive to negative New Crown. New crown positive refers to the positive result of the new crown nucleic acid test, which usually suggests that there is a new crown virus infection, when the result turns from positive to negative, it usually means that the new crown virus is no longer present in the infected person’s body. The main purpose of nucleic acid is to detect whether the secretion collected contains nucleic acid of the new crown virus, whether it is a new crown positive person or a negative person, you can continue to do nucleic acid. If a person is not properly protected, he/she may be re-infected if he/she comes into contact with the virus again. Therefore, a person who has become negative needs to stay in isolation in a designated place or at home for a certain period of time, during which he/she needs to go for nucleic acid tests regularly. It is recommended that those who have become negative should pay more attention to rest, avoid exertion, maintain a balanced diet and nutrition, and exercise appropriately to strengthen their own resistance. When you go out, wear a good protective mask, wash your hands frequently to reduce the number of gatherings.