2. Hu Yabo, member of the Standing Committee of Wuhan Municipal Committee and executive deputy mayor, introduced that there are 74 18 residential areas in Wuhan, including 3 159 property residential areas and 3,989 old open residential areas. With the joint efforts of all parties, comprehensive closed management has been realized. In the past three days, the city has once again carried out a major investigation of "four types of personnel". Judging from the summary results of surveys in various districts and the comparative analysis of big data, the problem that patients diagnosed in the early stage were not hospitalized in time has been basically solved. With the information closed-loop management of big data platform, the locking and tracking of close contacts will be more accurate and timely.