The precursors of asymptomatic infected people may be talking about asymptomatic novel coronavirus infected people, who usually do not have any noticeable symptoms. Usually asymptomatic novel coronavirus infected patients are those who have no clinical manifestations but have positive nucleic acid test results. These patients have no obvious symptoms in the early stages but are contagious and can be a potential source of infection and generally require isolation and observation. Generally asymptomatic patients with novel coronavirus infection need to be differentiated from patients in the latent phase of novel coronavirus pneumonia. Most patients in the incubation phase are asymptomatic and have positive nucleic acid test results, but they may develop symptoms such as cough and fever at a later stage, and there may be associated inflammation on imaging. It is recommended that asymptomatic infected persons should be isolated and seek medical attention to avoid delay. Tips] In this article, “new coronary pneumonia, new coronary virus pneumonia” has been renamed to “new coronary virus infection” on December 26, 2022, as announced by the National Health Commission.