Incremental cost effectiveness ratio (CER) was then calculated. Results Compared with no vaccination, DALY of immediate vaccination and vaccination after screening were 61.89 and 57.18 with CER 392.70 and 251.90 respectively.

• 结果 与不接种方案相比 ；直接接种方案和筛检再接种方案的DALY分别为 6 1.；888和 5 7