央视新闻客户端消息，今日15时，国务院联防联控机制召开新闻发布会，介绍进一步优化落实疫情防控措施。国家疾控中心卫生免疫处处长、一级巡视员夏刚介绍，80岁以上的老年人，如果不接种一剂疫苗，研究表明死亡风险为
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