The new coronavirus is widely spread and its lethality rate is lower than SARS, with a lethality rate of about 4-5% in Wuhan and 0.7% nationwide. The values are changing with the disease. The exact mortality rate needs to be obtained after the event is over based on the final average. The mortality rate of neocoronavirus is similar to the mortality rate of influenza, and the danger lies mainly in the insidious nature of the virus. Even if the diagnosis is positive, the patient may present insidiously or without manifestations. If a patient has been to an infected area unconsciously or has been in contact with an infected patient, he or she may carry the virus but will not isolate himself or herself, and contact with normal people may cause infection, especially dangerous for patients with poor autoimmune function. For high-risk people, who have autoimmune diseases, old lung diseases, diabetes or cardiovascular diseases, etc., they are easily infected by recessive patients later causing death. And SARS appears after fever and other respiratory symptoms are more obvious, easy to be recognized, even if distinguished, so the contagiousness is not very strong. In short, everyone should be fully aware of the new coronavirus, pay attention to self-isolation, and reduce the infection to other people. Content source: Dr. Yurai