A nurse vaccinates an Indonesian schoolboy  CHAIDEER MAHYUDDIN/AFP/Getty Images




但这一落在一些世界最脆弱群体头上的悲剧在很多情况下完全是可以避免的。《卫生事务》(Health Affairs)杂志2月号发表一篇新研究的表明还有一个选择:在很多例子中,医疗成本可以通过预防免除,即广泛使用平价疫苗。

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