Teachers check dividers on desks in a class ahead of school reopening at Junghwa Girls High School in Daegu, South Korea, Tuesday, May 19, 2020. South Korean Vice Health Minister Kim Gang-lip urged vigilance to maintain hard-won gains against the virus and called for education officials to double check preventive measures with high-school seniors returning to school on Wednesday. (Kim Hyun-tae/Yonhap via AP)