New crown generally refers to new coronavirus pneumonia. If the patient is protected after recovery, the probability of recurrence is low. If the patient remains unattended and unprotected, the probability of recurrence is high. If the patient has recovered from the new coronavirus pneumonia, he/she should pay attention to the protection measures, such as wearing masks, avoiding close contact with others, and opening windows for ventilation. At the same time, if the patient is active in daily exercise and ensures a balanced intake of nutrients, the probability of re-positive test is not high. If the patient does not pay attention to the disease and take protective measures after recovery, and still has close contact with others, the probability of relapse is high. If a patient who has recovered from the new coronavirus pneumonia develops fever, cough, weakness and other symptoms again, it is necessary to consult a doctor for a nucleic acid test in order to determine whether the patient is infected with the new coronavirus again. In order to prevent reinfection, in addition to strengthening measures and personal care, attention should also be paid to maintaining physical and mental happiness and avoiding excessive tension and anxiety. Patients who have recovered from novel coronavirus pneumonia are advised to undergo regular checkups to monitor their health conditions. Tip: In this article, the terms “new coronavirus pneumonia” and “new coronavirus pneumonia” were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.