On April 7, Wu Yingchuan, secretary of the general branch of Changli Garden Residential Area in Pudong New Area, Shanghai, asked to resign, saying in an open letter to residents that in the past five months, he has locked down the building three times, locked down the community twice, and accumulated nine nucleic acid tests and antigen tests for all employees, "The basic security of more than 4,000 people is all on the eight people of the neighborhood committee." He also pointed out that the CDC's information is lagging behind, the epidemic prevention arrangements are extremely opaque, and the neighborhood committee cannot grasp who is positive and who is a close contact.