流感不是同一種病毒，每年不一樣。打了疫苗照樣可以感染疫苗沒cover到的病毒。艾滋病毒是固定的。

來源: AprilMei 於 2023-01-23 18:01:30 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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