Repeated recurrence of the new coronavirus may be caused by a small amount of surviving virus remaining in the body, or repeated infections and inactivated virus in the body. 1. A small amount of surviving virus remains in the body. Although the clinical symptoms of patients with new coronavirus pneumonia are under control and the condition is in a stable state, it is not excluded that a small amount of surviving virus may remain in the body. At this time, the nucleic acid test may be sometimes negative and sometimes positive, resulting in the nucleic acid test re-positive situation. 2. Reinfection, although patients with novel coronavirus infection have been clinically cured, they may be re-infected, so re-infection is also one of the reasons for the re-positive nucleic acid test. 3. Inactivated virus in the body. A positive nucleic acid test result only means that the nucleic acid sequence of the new coronavirus has been detected, but it does not necessarily mean that the virus is alive. Therefore, if there is inactivated virus in the body of a patient who has recovered from new coronavirus pneumonia and the virus has not been completely eliminated, a positive nucleic acid test result may also appear intermittently. To sum up, when the new coronavirus is repeatedly positive, it is necessary to further analyze the corresponding reasons and take targeted measures to deal with it. Tip: “New coronavirus pneumonia” and “new coronavirus pneumonia” mentioned in this article have been renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.