Mild cases of new crowns may have sequelae, depending on the condition of the patient’s own immune system and the degree of infection of the new crowns. In contrast, timely vaccination and systematic treatment can effectively protect the organism. The chance of sequelae of mild neo-crown infection is low. However, if the infection lasts for a long time, or if the patient has cough, sore throat, fever, etc., the infection process may stimulate the body to develop different degrees of throat damage or nerve damage, which may lead to hoarseness and immune deficiency after the new crown is cured, and other mild sequelae, but the chance of occurrence is relatively low. Improvement of the vaccination of the new crown can effectively reduce the chances of severe disease, so that most of the people in the infection manifested as a mild disease, thus reducing the chances of the emergence of sequelae. Prompt isolation and treatment after infection can also promote faster recovery and reduce or avoid the occurrence of adverse sequelae. Since there is no direct conclusive evidence of sequelae from new crowns, it is recommended that personal protection be taken in order to avoid damage to the organism.