High incidence of asymptomatic SARS-CoV-2 infection, Chongqing, China

Yang Tao; Panke Cheng; Wen Chen; Peng Wan; Yaokai Chen; Guodan Yuan; Junjie Chen; Da Huo; Ge Guan; Dayu Sun; Ju Tan; Guanyuan Yang; Wen Zeng; Chuhong Zhu

All countries have adopted isolation measures for imported populations from areas or countries with severe SARS-CoV-2 infection, and treated patients with symptoms who have a history of contact with this imported population 1 . However, a large number of asymptomatic patients with contact history with imported cases failed to be included in the focus surveillance. Our study shows for the first time that asymptomatic patients with SARS-CoV-2 infection have a contact history with imported case account for a large proportion. Therefore, the next stage of SARS-CoV-2 prevention and control needs to focus on the screening of asymptomatic patients in the community with a history of contact with the imported population, especially for children and the elderly.