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满足这4个条件，疾病就可以被永久消灭？
source link: https://tech.sina.com.cn/d/f/2019-12-06/doc-iihnzahi5636364.shtml
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经过十几年的努力，人类在1980年消灭了天花病毒，这也是目前唯一一种被人类彻底消除的病毒。与之相比，对于很多病原体，人类付出了几十年的努力，却依旧无法根除。为什么只有天花病毒被消灭了？哪些条件决定了根除某种病原体的难易程度？在这篇文章中，作
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