前两年有大学生死于乙性脑炎，之后美国大学要求必须免疫接种脑炎疫苗以防疫情爆发

来源: Diana-Sun 于 2016-02-12 11:13:20 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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