就算结论是XBB变种和前面的变种比较更容易传染给打过疫苗的人，是不是也要有没打过疫苗的做对照组？

来源: 远阡于 2023-01-16 09:52:47 [旧帖] [给我悄悄话] 本文已被阅读：次

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