Asymptomatic infected people generally do not show clinical symptoms. Asymptomatic infected people are generally developed from hidden infected people, is in a state of pathogen carrying. That is, after the pathogen invades the human body, it can stay in the invasion site or invade the more distant organs to continue to reproduce, and the human body does not show any disease state, but can carry and exclude pathogens, and become a source of infectious disease epidemic. Asymptomatically infected persons with C. neoformans, for example, do not perceive clinical signs associated with C. neoformans, such as fever, cough, sore throat, diarrhea, or other self-perceived or clinically recognizable signs and symptoms. Asymptomatically infected persons with C. neoformans may test positive for C. neoformans virus in specimens such as respiratory specimens (usually a positive nucleic acid test) or may be positive for serum-specific immunoglobulins IgG and M in the absence of C. neoformans vaccination. Therefore, asymptomatic infected persons usually do not show clinical symptoms and can only be detected by nucleic acid or antigen testing. 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.