On April 20, Pang Xinghuo, deputy director of the Beijing Center for Disease Control, said at the press conference that the grading standard for high-risk areas is that the cumulative number of confirmed cases exceeds 50, and there is an aggregate epidemic within 14 days. According to this standard, on April 14th, an imported case diagnosed in Chaoyang District caused the infection of three families and became a cluster epidemic, so it was classified as a high-risk area. Beijing quickly isolated treatment cases and isolated close contacts; the nucleic acid test results of residents in the same building were negative; the place where the case had been moved was disinfected. (Editor Lu Jie)
Editor in charge: [Li Yuxin]