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Continue to Chat美FDA發布新冠疫苗官方指南獲批疫苗需在至少50%的接種者中有效 https://blog.wongcw.com/2020/07/01/%e7%be%8efda%e7%99%bc%e5%b8%83%e6%96%b0%e5%86%a0%e7%96%ab%e8%8b%97%e5%ae%98%e6%96%b9%e6%8c%87%e5%8d%97%e7%8d%b2%e6%89%b9%e7%96%ab%e8%8b%97%e9%9c%80%e5%9c%a8%e8%87%b3%e5%b0%9150%e7%9a%84%e6%8e%a5/