On December 29, 2019, the health departments of Hubei Province and Wuhan City received a report of an aggregated unexplained pneumonia case in a local hospital, and all four patients were employees of the South China Seafood Wholesale Market; on the 30th, the health departments of Hubei Province and Wuhan City launched an investigation and case search; on the 31st, 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 Wuhan Municipal Government On January 8, the novel coronavirus was confirmed as the pathogen of the outbreak.