Fever is a symptom of novel coronavirus infection, but fever alone does not confirm the diagnosis of novel coronavirus infection; it is necessary to combine the epidemiologic history of the patient with relevant ancillary tests to make a definitive diagnosis. If the patient has a history of epidemiologic exposure and recent exposure to suspected or confirmed cases, he or she should actively seek medical attention and complete the relevant investigations. Patients with novel coronavirus infection may have normal or below-normal leukocytes, below-normal lymphocytes, normal calcitonin, and interstitial changes in the lungs, predominantly peripheral, on lung CT. When the above clinical symptoms and examination abnormalities occur, it is considered that the possibility of novel coronavirus infection is very high, and further nucleic acid testing is needed, and two consecutive positive nucleic acid tests are the main basis for confirming the diagnosis of novel coronavirus infection.