Once infected with SARS, the situation is more dangerous, while the death rate of novel coronavirus pneumonia is less than 4%, i.e., its severity is lower than that of SARS. According to the number of infections, the new coronavirus is much more infectious than SARS, as SARS eventually infected about 9,000 cases worldwide, while the new coronavirus pneumonia has exceeded 100,000 cases worldwide, and the new coronavirus pneumonia is often aggregated, one person is infected, causing the whole family to be infected, and about 70% of patients may come from the aggregated infection. However, judging from the pathogenicity and morbidity and mortality rate, SARS is stronger than the new coronavirus, and the morbidity and mortality rate of SARS in that year was about 9.6%, which means that nearly 1/10 patients were not rescued eventually. Content source: Dr. You Lai