On May 28, at the 348th press conference on the prevention and control of the novel coronavirus pneumonia in Beijing, Liu Xiaofeng, deputy director of the Municipal Center for Disease Control and Prevention, introduced that in April From the 22nd to 24:00 on May 27th, no infected persons were reported in Pinggu District; Mentougou District, Huairou District, Yanqing District, and Economic Development District did not report social screening of infected persons; Shunyi District and Miyun District did not report social aspects for more than 10 days. Screening of infected persons; Fangshan District did not report social screening of infected persons for more than 7 days; Chaoyang District, Tongzhou District, and Daxing District did not report social screening of infected persons for more than 3 days.