On December 29, 2019, the health departments of Hubei Province and Wuhan City received reports of cases of aggregated unexplained pneumonia at a local hospital, and all four patients were employees of the South China Seafood Wholesale Market; on December 30, the health departments of Hubei Province and Wuhan City initiated investigations and case searches; on December 31, the National Health and Wellness Commission and the Chinese Center for Disease Control and Prevention intervened in the investigation and response, and on the same day, the On January 8, the novel coronavirus was confirmed as the pathogen of the outbreak. on January 20, 2020, academician Zhong Nanshan announced for the first time the existence of human-to-human transmission, and the novel coronavirus pneumonia attracted widespread social attention.