Another study to consider when comparing vaccines is one from the Mayo Clinic earlier this month, which is awaiting a full review.

That study found the risk of suffering a breakthrough COVID-19 infection with the delta variant after being fully vaccinated with the Moderna vaccine may be much lower than the risk for those who received the Pfizer vaccine.

The study reported that in July in Florida, where COVID cases are at an all-time high and the delta variant is prevalent, the risk of a breakthrough case was 60% lower for Moderna recipients as compared to Pfizer recipients.

Similarly, in Minnesota last month, the authors found that the Moderna vaccine (also known as mRNA-1273) was 76% effective at preventing infection, but the Pfizer vaccine (known as BNT162b2) was 42% effective.
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比较疫苗时要考虑的另一项研究是本月早些时候梅奥诊所的一项研究，该研究正在等待全面审查。

该研究发现，在完全接种 Moderna 疫苗后，感染 delta 变异体的突破性 COVID-19 感染的风险可能远低于接种辉瑞疫苗的人的风险。

该研究报告称，在佛罗里达州 7 月，COVID 病例处于历史最高水平且 delta 变体普遍存在，与辉瑞（Pfizer）接受者相比，Moderna 接受者发生突破性病例的风险降低了 60%。

同样，上个月在明尼苏达州，作者发现 Moderna 疫苗（也称为 mRNA-1273）在预防感染方面的有效率为 76%，而辉瑞疫苗（称为 BNT162b2）的有效率为 42%。