The new coronavirus is the new coronavirus. After the nucleic acid test for the new coronavirus is negative, it is usually not contagious. However, to be on the safe side, it is still necessary to follow the local immunization policy for testing, in order to prevent the situation that the virus is negative and then returns to the positive side. Patients infected with the novel coronavirus become a source of infection, and the virus can be expelled from the body through sneezing and coughing, thus infecting other people. A negative test means that the virus is no longer detected in the body of the tested person, and since the virus is not excreted, it will not be transmitted to other people and is not contagious. It is recommended not to go out unless necessary and to minimize going to crowded places. When you must go out, you need to wear a mask to protect yourself. You can exercise moderately to increase your immunity. The duration of quarantine and the frequency of nucleic acid testing should be based on local policy.