国内由于三年严防死守，感染率低，所以没有免疫力，疫苗的效果可能也差，所以这次一下子就爆发了

来源: laopika 于 2022-12-17 12:01:52 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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