From the current treatment of novel coronavirus pneumonia, most patients have a good prognosis, and a few patients are critically ill. The high-risk groups for severe and critical illnesses are as follows: 1, elderly people older than 65 years old; 2, people with cardiovascular diseases: such as hypertensive patients; 3, people with chronic lung diseases: moderate to severe asthma; 4, patients with underlying diseases: diabetes, chronic liver disease, chronic kidney disease, and tumors, etc.; 5. Patients with immune deficiency: such as patients with long-term application of immunosuppressive drugs or AIDS; 6. Obese people; 7. Heavy smokers; 8. Women in late pregnancy and perinatal period. The above high-risk groups account for more than 90% of patients with severe and critical illnesses.