時間久了，抗體水平下降了。再打就又有了；如果再打依然沒有（可能性很小）說明免疫係統有缺陷

來源: RockAZ 於 2024-04-23 10:33:00 [舊帖] [給我悄悄話] 本文已被閱讀：次

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