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the claim
Vaccine efficacy measures the proportionate reduction of disease in a vaccinated group.
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
2 sources for · 0 against
AS REPORTEDno primary record reached; this is what the reporting says

Evidence establishes that vaccine efficacy measures the proportionate reduction of disease cases or attack rates in a vaccinated group compared to an unvaccinated group.

Evidence for · 2
Wikipedia: Vaccine efficacy
cited by 0
Reference article covering this claim directly
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How claims like this are judged

Judged against reference works: claims of this kind are settled by reference works, not journal abstracts.

More for · 1
Book: Applied Communicable Disease Control
2018 · cited by 0
Mentions reduction in disease attack rate between unvaccinated and vaccinated cohorts.
The paper trail · every fact has a biography
first checked04 Aug 2026
judged → SUPPORTED · 7504 Aug 2026
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