The new crown refers to the new coronavirus pneumonia, which is a Category B infectious disease. New coronavirus pneumonia is an acute respiratory infectious disease, which is categorized and managed according to the danger and severity of the disease. It is a Category B infectious disease, and because it is highly contagious, it is usually managed, prevented and controlled as a Category A infectious disease. The management of Category A infectious diseases is relatively strict. The time limit for reporting infectious diseases is two hours, requiring that the disease be reported within two hours after discovery, and in order to prevent the spread of the epidemic, isolation measures can be taken, or mandatory isolation measures can also be taken. New coronavirus pneumonia is a new disease, transmitted from person to person, highly contagious, with a high mortality rate and great danger. Once diagnosed as new coronavirus pneumonia, or when it is a suspected case, it is required to go to a designated hospital for strict isolation and observation and treatment. If there are symptoms related to new coronavirus pneumonia, it is recommended to report to the community in a timely manner, improve the nucleic acid test, and actively cooperate with the isolation treatment. Tips] The “new coronavirus pneumonia” and “new coronavirus pneumonia” mentioned in this article have been renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.