reopening strategies that ensure low classroom occupancy and a solid infrastructure to quickly identify and isolate new infections. 摘要:我们将丹麦、挪威、瑞典和德国各州作为个案研究,调查学校关闭和随后的重新开放对新型冠状病毒肺炎传播的影响。通过比较不同干预措施下每日住院或确诊病例的增长率,我们提供的证据表...