BTW,Delta,哪里有Delta死亡率的客观对照研究?
还有,既然有研究,半年左右,pfizer类的疫苗,有效性就剩47%。这能叫好疫苗吗?
BTW,Delta,哪里有Delta死亡率的客观对照研究?
还有,既然有研究,半年左右,pfizer类的疫苗,有效性就剩47%。这能叫好疫苗吗?
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