April 11 according to the State Council joint prevention and control mechanism related provisions, Shanghai combined with the actual, according to the sealing and control area, control area, preventive area to implement the zoning classification differentiated prevention and control. Reporters from the 11th held in Shanghai epidemic prevention and control work press conference was informed that, according to the preliminary screening results and risk assessment, Shanghai districts delineated the first batch of “three areas” list. Among them, 7624 sealed control area, control area 2460, preventive area 7565.