COVID-19 Vaccine Efficacy vs. Effectiveness: What's the Diff

COVID-19 Vaccine Efficacy vs. Effectiveness: What's the Difference?


Apr 30, 2021 01:03 PM EDT
What is the difference between COVID-19 vaccine efficacy and effectiveness? Understanding these terms could assist readers in making well-informed decisions when getting the vaccine.
(Photo : Getty Images)
Vaccine Effectiveness and Efficacy 
With the proceeding India Covid-19 vaccination campaign, two terms that seem similar are likely to get misinterpreted: vaccine effectiveness and vaccine efficacy.
The dictionary definition of these terms is not the same as the way they are used in scientific discussion.
Most people understand vaccine efficacy to mean the percentage of people who would not contract the disease after getting the vaccine.
It is also interpreted sometimes as the percent of possibility that a person already vaccinated would be protected from the disease. However, it is not as forthright.

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