时间久了，抗体水平下降了。再打就又有了；如果再打依然没有（可能性很小）说明免疫系统有缺陷

来源: RockAZ 于 2024-04-23 10:33:00 [旧帖] [给我悄悄话] 本文已被阅读：次

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