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來源: dudaan 於 2021-02-01 06:03:53 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (727 bytes)
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The reported efficacy rates of 94 or 95 percent are for symptomatic disease only. Because the clinical trials for Pfizer and Moderna did not require regular testing for COVID-19, they were not a good indication of how well the vaccine protects against asymptomatic disease (which account for some 40 percent of cases).

https://www.ucsf.edu/news/2021/01/419691/covid-19-vaccine-fact-vs-fiction-expert-weighs-common-fears?

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