Screening for new coronavirus is usually performed by means of nasopharyngeal swab viral nucleic acid test, blood routine, C-reactive protein, calcitoninogen, and chest CT. If the patient has a history of living in an infected area or a history of close contact with patients with novel coronavirus pneumonia, and has symptoms such as fever, dry cough, and malaise, it is recommended to go to a sentinel hospital to undergo the above tests. If the viral nucleic acid test is negative, and the patient’s blood routine, C-reactive protein, and chest CT results are normal, the diagnosis of neocoronavirus pneumonia can generally be ruled out. If the chest CT shows multiple flaky ground glass shadows, the diagnosis of neocoronaryngitis is suspected, and multiple viral nucleic acid tests are needed, because the positive rate of viral nucleic acid tests is 30%-50%.