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有必要强制接种疫苗吗？听听专家怎么说

 5 years ago
source link: https://tech.sina.com.cn/d/f/2019-08-14/doc-ihytcitm9041193.shtml
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来源：Nature自然科研今年1-4月，世界卫生组织（WHO）共报告了约22.6万例麻疹病例，几乎是去年同期记录的三倍（参见go.nature.com/2jkq8d3）。自2000年开始，美国境内的麻疹病毒不再持续传播，但是，今年美国报告的

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