uc8

疾病控制题库/多项选择题

影响人群易感性降低的主要因素有

  • A有计划、有步骤地开展预防接种工作
  • B流行后免疫人口的增加
  • C隐性感染后免疫人口的增加
  • D新生儿在人群中比例的增加
  • E免疫人口的迁入
参考答案: ABCE
解题思路: >>>立即刷题
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