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。
