Both SARS in 2003 and this new coronavirus pneumonia are coronavirus infections, and the site of infection is the lung; SARS is a relatively more severe virus, with about 5000 cases in 2003, with a case fatality rate of nearly 10%, and many of them are patients with severe pneumonia, which manifests itself as the so-called “big white lung”, with severe respiratory distress and rapid onset of the disease, which usually peaks in two to three days. This time, the characteristics of the new coronavirus pneumonia are lower than the previous case fatality rate, most of them are mildly ill patients, the onset of the incubation period is relatively long, an average of 7 days, the shorter 2-3 days, the longer 10-12 days. It is characterized by greater infectiousness and relatively low lethality. Source: Dr. Yurai