The novel coronavirus is not a SARS virus. Although the genome sequence similarity between the novel coronavirus and SARS virus is 80%, the genetic sequence differences are still large, and it is considered a novel human infectious type B coronavirus. However, the original host of the virus is the same as that of SARS virus, which is a bat. Compared with SARS virus, the novel coronavirus is more cunning, as SARS virus achieves cross-species transmission after three months, while the novel coronavirus achieves “wild animal-to-human transmission” and “limited human-to-human transmission” to “human-to-human transmission” stages. It took less than a month for the novel coronavirus to achieve the various stages of “wildlife to human”, “limited human to human” and “human to human” transmission.