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为什么群体免疫力减弱导致麻疹暴发

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为什么群体免疫力减弱导致麻疹爆发 – 哥伦比亚广播公司新闻

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麻疹早在几十年前就在美国被根除,但疫苗接种率的下降威胁到该国对这种疾病的群体免疫力。据报道,新的疫情已经爆发,包括费城的9例病例,影响了一家医院和一家日托中心。斯蒂芬·斯托克(Stephen Stock)报道。

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