The sequelae of infection with New Crown Virus delta are commonly persistent cough, pulmonary fibrosis, chest tightness and shortness of breath, etc., but there is no clear analysis of the results. 1. Persistent cough: Because the delta strain of the new coronavirus can cause different degrees of allergic reactions or mucosal damage to the respiratory mucosa in the course of infection, chronic inflammation of the throat and persistent cough can also occur after cure. 2. Lung fibrosis: New coronavirus delta strain or other strains can directly cause lung tissue damage or fibrosis symptoms during the infection process. Therefore, even after cure, the lung fibrosis cannot be recovered immediately, thus creating sequelae. 3. Chest tightness and shortness of breath: All strains of the new coronavirus are respiratory infectious viruses. When infected with Delta strain or other strains, they will cause different degrees of damage to the heart and lungs, and affect the respiratory function. In the event of infection with delta or other strains of neocoronavirus, isolation treatment should be carried out immediately, and appropriate treatment programs should be selected under the guidance of a doctor.