Asymptomatic infections are the ones that affect the risk level. According to the definition of aggregated outbreaks in the Prevention and Control Program for Novel Coronavirus Pneumonia (Eighth Edition), aggregated outbreaks are defined as 5 or more cases and asymptomatic infected persons found within 14 days in schools, natural villages, and healthcare facilities. The number of aggregated outbreaks directly determines the classification of medium and high risk areas, and for this reason, asymptomatic infected persons can affect the risk level. Asymptomatic infected persons are those who are positive for novel coronavirus pathogenicity but without relevant clinical manifestations. They are mainly detected through nucleic acid testing of key populations such as close contacts and close contacts, epidemiologic investigations, and population screening. Therefore, it has a certain degree of invisibility. In daily life, especially in densely populated places, it is also necessary to correctly and scientifically wear masks to reduce the risk of being infected, to avoid a certain impact on health. In addition to this, we also need to pay attention to maintain good hand hygiene, disinfection at any time, as far as possible to reduce the risk of infection. [Tip] In this article, “new coronavirus pneumonia, new coronavirus pneumonia”, etc., has been December 26, 2022, the National Health Commission issued a notice to change the name to “new coronavirus infection”.