老大藏在这里信口开河呢？再次告诉你mRNA疫苗80%防delta感染，一般的外科口罩降低11%的感染风险。文献早给你了啊！

来源: 业余城管于 2021-09-24 17:06:38 [旧帖] [给我悄悄话] 本文已被阅读：次

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