If infected with New Crown is usually detected by taking a nucleic acid test, which usually detects New Crown infection in about 1~5 days. New crown infection usually leads to new coronavirus pneumonia, patients may be accompanied by fever, fatigue, dry cough, respiratory difficulties and other uncomfortable symptoms, or no symptoms, after infection with the new crown virus can be detected by nucleic acid testing method in about 1~5 days. Nucleic acid testing is usually used to determine whether or not a person is infected with Neocoronavirus by testing the nucleic acid of the Neocoronavirus. If the nucleic acid test is negative, it means that the person is not infected with Neocoronavirus. If the nucleic acid test is positive, it means that there is a possibility of neocollins infection. For those who are highly suspected to be infected with Neocollins, if the nucleic acid test result is negative, it is recommended to retest after a 24-hour interval to rule out the possibility of false-negative results. Once an infected person is detected, he/she should be reported promptly according to local policy and isolated for treatment. [Note: In this article, the terms “neocoronavirus pneumonia and novel coronavirus pneumonia” were renamed to “novel coronavirus infection” on December 26, 2022, as announced by the National Health Commission.