Although the novel coronavirus and the SARS virus are genetically similar and have a lot of homology, they are indeed two different viruses, and they are still very different in terms of infectivity and lethality. In terms of lethality, SARS is more serious, about 40.7%, while the lethality rate of the new coronavirus is much lower than that of SARS, about 2.3%. In terms of transmission capacity, the new coronavirus is no less transmissible than SARS. In a comprehensive comparison, SARS is more serious.