New crown should be new coronavirus pneumonia, new coronavirus pneumonia re-positive people are infectious. New coronavirus pneumonia is a new acute infectious disease. A patient who is positive again for new coronavirus pneumonia is one who has been cured and then tested positive again for nucleic acid, which may be due to a weakening of the patient’s own immunity, leading to re-infection with the virus, or it may be the case that the patient has not been cured of the infection for the first time, and the virus is still present in the patient’s body, where it can be passed on to other people through respiration or droplet infection. In either case, a person who is re-positive is contagious. It is recommended to report to the community and go to a specific institution for isolation and treatment after contracting novel coronavirus pneumonia. Since there are differences in individual patients, and everyone’s physical quality is different, the development of the disease after cure varies from person to person, and there is a possibility of re-positive, therefore, it is recommended that patients with new coronavirus should still be retested for nucleic acid regularly after cure, and should go to a specific institution for quarantine and treatment if they are positive again in a timely manner. Tip: “New coronavirus pneumonia and new coronavirus pneumonia” mentioned in this article were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.