flu 不是终生免疫，就那几种 flu 病毒，免疫时间长的化就不会每年爆发flu。小孩 flu 的死亡率高于老人

来源: STEMkid 于 2025-02-27 07:31:39 [旧帖] [给我悄悄话] 本文已被阅读：次

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