To determine whether there is an epidemiologic basis for novel coronavirus pneumonia, it is because for any infectious disease, it is necessary to determine whether there is a history of contact, such as whether there has been a visit to Hubei or Wuhan within 2 weeks, whether there has been contact with a person who has come back from Wuhan within 2 weeks or whether there has been contact with a patient with novel coronavirus pneumonia within 2 weeks. If so, there is an epidemiologic basis; 2. Clinical manifestations, such as fever, dry cough, muscle pain. Blood is drawn to see if there is a decrease in white blood cells, if there is a decrease in lymphocytes, and if there are any hairy glass-like changes in both lungs on lung CT. 3. The definitive diagnosis is still made by nucleic acid testing, and a positive test is required to definitively identify a new coronavirus pneumonia. Source: Dr. Yurai