变异是常态，只有突变后仍能存活的会传染下去，所以，疫苗就像抗生素，存活的病毒会越来越历害。

来源: FollowNature 于 2021-09-06 06:18:00 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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