According to a CCDC publication on 31 January 2020, the facts leading up to the identification of the 2019-nCoV were as follows, "On 29 December 2019, a hospital in Wuhan admitted four individuals with pneumonia and recognized that all four had worked in the Huanan Seafood Wholesale Market, which sells live poultry, aquatic products, and several kinds of wild animals to the public. The hospital reported this occurrence to the CCDC, which led Wuhan CCDC staff to initiate a field investigation with a retrospective search for pneumonia patients potentially linked to the market. The investigators found additional patients linked to the market, and on 30 December, health authorities from Hubei Province reported this cluster to CCDC.