摘要 : Background. Most deaths in the 1918 influenza pandemic were caused by secondary bacterial pneumonia. Methods. We performed a systematic review and reanalysis of studies of bacterial vaccine efficacy (VE) in preventing pneumonia an... 展开 Background. Most deaths in the 1918 influenza pandemic were caused by secondary bacterial pneumonia. Methods. We performed a systematic review and reanalysis of studies of bacterial vaccine efficacy (VE) in preventing pneumonia and mortality among patients with influenza during the 1918 pandemic. 收起