Vaccine effectiveness is a measure of how well vaccines work in the real world. So what does “95% Efficacy” mean though?
Pfizer reported that its vaccine shows a 95% efficacy. That sounds like it protects you 95% of the time. But that’s not what that number actually means. That is the relative risk reduction which does NOT tell you what your overall risk is reduced by vaccination. For that number, we need to look at absolute risk reduction. This video explains the difference and why it’s important to understand.
https://www.canadiancovidcarealliance.org/page/2/?s=efficacy+
Here is how much protection each Vax ACTUALLY gives you.
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