Vaccine efficacy measures the proportionate reduction of disease in a vaccinated group.

the verdict

SUPPORTED

the evidence backs this

Recorded sources

2 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

AS REPORTEDno primary record reached; this is what the reporting says

Is it true that vaccine efficacy measures the proportionate reduction of disease in a vaccinated group?

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

Verdict: SUPPORTED · 2 sources for, 0 against · Last checked 4 Aug 2026

How claims like this are judged

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

Evidence for · 2

Wikipedia: Vaccine efficacy

Reference article covering this claim directly

Get citation

Wikipedia: Vaccine efficacy. (n.d.). Wikipedia. https://en.wikipedia.org/wiki/Vaccine_efficacy

See more details

More for · 1

Book: Applied Communicable Disease Control

2018

Mentions reduction in disease attack rate between unvaccinated and vaccinated cohorts.

Get citation

Cragg, L., Nutland, W., & Rudge, J. (2018). Book: Applied Communicable Disease Control. McGraw-Hill Education (UK). https://play.google.com/store/books/details?id=eskvEAAAQBAJ&source=gbs_api

Related receipts

A vaccine effectiveness rate of 95% means a 95% reduction in disease incidence among vaccinated individuals SUPPORTED related question, same topic

Receipt History

first checked04 Aug 2026

judged → SUPPORTED · 7504 Aug 2026

Anyone with this link can read the claim and its public receipt, including any personal information in that text. Open permanent receipt.

Check your own claim

Challenge the receipt

I have a source that contradicts this verdict I have a source that supports it No source: request a receipt review Requests are recorded for review. This does not start an automatic check or guarantee a response time.

Citation formatting by citeproc-js (Frank Bennett) and the Citation Style Language project. Source and licenses.

This receipt is an automated verdict against our published method · not an opinion about any author or publication.
Terms · Privacy · How verdicts work