Infection with New Crown is usually detected after an incubation period of 3 to 7 days. The tests for New Crown pneumonia are the pharyngeal swab nucleic acid test, routine blood test, and chest CT test, which are combined and then evaluated with symptoms and epidemiologic history. The most specific test is the pharyngeal swab nucleic acid test, which is a confirmatory diagnostic tool. It usually takes at least 3 days after infection with C. neoformans before nucleic acids may be present in the pharynx, and the nucleic acid load may be low at the beginning, resulting in non-detection, so repeat testing is required. If there are clinical symptoms but the test is negative, this cannot be easily ruled out and a repeat test is needed. With the advancement of testing methods, a new blood antibody test has been added. It is usually considered that infection can be ruled out if a suspected case is negative after two throat swabs for nucleic acid, with a 24-hour interval between the two throat swabs, plus more than 7 days after the onset of the disease, when the test for antibodies is still negative. If infection occurs, the vast majority of patients will test positive within 7 days. If you have stayed in an outbreak risk area and have symptoms such as fever, sore throat, headache, nasal congestion, runny nose, etc., you should go to a designated nucleic acid point for testing promptly. 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.