A somewhat low fever cannot determine whether a novel coronavirus infection is present. It depends on whether the patient with fever has an epidemiological history, and its very important in diagnosing cases of novel coronavirus infection. The epidemiological history includes the following: 1. whether the patient has been to the infected area, whether there is a history of contact with patients in the infected area, whether there is a history of close contact with suspected or confirmed patients around. 2. whether there is a characteristic of aggregated morbidity, that is, whether there is a characteristic of familial aggregation of new coronavirus infection around. If there is no epidemiological history, you can also look at the symptoms in addition to low-grade fever, whether there is weakness, dry cough or diarrhea. 3, whether the blood routine has a lower lymphocyte count, white blood cells and neutrophils are normal or low. It is necessary to meet the characteristics of laboratory tests as well as epidemiological history and typical features of symptoms to confirm the diagnosis of novel coronavirus infection.