A vaccine effectiveness rate of 95% means a 95% reduction in disease incidence among vaccinated individuals
the verdict
SUPPORTED
the evidence backs this
confidence 75/100
A vaccine effectiveness or efficacy rate represents the percentage reduction in the number of disease cases among a vaccinated group compared to an unvaccinated group.
Evidence for · 3
Wikipedia: Vaccine efficacy
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Reference article covering this claim directly
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More for · 2
who.int: Vaccine efficacy, effectiveness and protection
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Explains that efficacy is based on how many vaccinated people developed disease compared to those receiving a placebo.
en.wikipedia.org: Vaccine efficacy
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States that an efficacy or effectiveness percentage represents the decrease in disease cases among a vaccinated group versus an unvaccinated group.