Workers make face masks in the workshop of a textile company in Jimo district of Qingdao, East China's Shandong province, Feb 12, 2020. [Photo/Xinhua] China's present manufacturing of masks is at 94 ...

Face mask use by the primary case and family contacts before the primary case developed symptoms was 79% effective in reducing transmission (OR=0.21, 95% CI 0.06 to 0.79). ... medical workers caring ...