變異是常態，隻有突變後仍能存活的會傳染下去，所以，疫苗就像抗生素，存活的病毒會越來越曆害。

來源: FollowNature 於 2021-09-06 06:18:00 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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