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In response to
"Also I don't know how to read this. Is it saying 1 in 4 (roughly. 23%.) breakthrough cases of Pfizer vaccinated people resulted in hospitalization? -- nm"
by
ty97
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I don't think so.
Posted by
mara
Sep 22 '21, 12:11
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"So, for example, let’s imagine a vaccine with a proven efficacy of 80%. This means that – out of the people in the clinical trial – those who received the vaccine were at a 80% lower risk of developing disease than the group who received the placebo. This is calculated by comparing the number of cases of disease in the vaccinated group versus the placebo group. An efficacy of 80% does not mean that 20% of the vaccinated group will become ill."
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