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HEALTH

The Claim

COVID-19 vaccinated individuals die from the Delta variant at higher rates than unvaccinated individuals.

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The Short Version

This claim is false. Multiple high-authority CDC and peer-reviewed studies consistently found that unvaccinated individuals died from the Delta variant at 11 to 53 times the rate of vaccinated individuals. Vaccine effectiveness against Delta-related death was 90–91%. The claim likely stems from a well-documented statistical misunderstanding: in highly vaccinated populations, raw death counts among vaccinated people can appear large, but per-capita death rates were dramatically lower for vaccinated individuals.

Caveats

  • The claim exploits the 'base rate fallacy': when most of a population is vaccinated, raw death counts among vaccinated people can seem high even though their per-capita death rate is far lower than the unvaccinated.
  • Waning immunity in specific older subgroups (e.g., those vaccinated earliest) was real but did not reverse the overall vaccinated-vs-unvaccinated mortality gap — it only narrowed protection over time within vaccinated cohorts.
  • This type of misleading statistical framing has been widely used to discourage vaccination; multiple fact-checkers and data analysts have explicitly identified it as a misuse of statistics.

The Receipts

  1. COVID-19 Incidence and Death Rates Among Unvaccinated and Fully Vaccinated Adults with and Without Booster Doses During Periods of Delta and Omicron Variant Emergence — 25 U.S. Jurisdictions, April 4–December 25, 2021 - PMC

    PMC

  2. Delta Variant in the COVID-19 Pandemic: A Comparative Study on Clinical Outcomes Based on Vaccination Status - PMC

    PMC

  3. Monitoring Incidence of COVID-19 Cases, Hospitalizations, and Deaths, by Vaccination Status — 13 U.S. Jurisdictions, April 4–July 17, 2021 | MMWR - CDC

    CDC

  4. COVID-19 Incidence and Mortality Among Unvaccinated and Vaccinated Persons Aged ≥12 Years by Receipt of Bivalent Booster Doses and Time Since Vaccination — 24 U.S. Jurisdictions, October 3, 2021–December 24, 2022 | MMWR - CDC

    CDC

  5. Covid-19 Rates by Time since Vaccination during Delta Variant Predominance - PMC

    PMC

  6. The Relationship of COVID-19 Vaccination with Mortality Among 86,732 Hospitalized Patients: Subpopulations, Patient Factors, and Changes over Time - PMC

    PMC

  7. Trials: COVID vaccines 90% effective against Delta infection, death - CIDRAP

    CIDRAP

  8. Full COVID vaccination tied to lower risk of heart conditions, death | CIDRAP

    CIDRAP

  9. Transparency and data – UKHSA's vaccines report – UK Health Security Agency

    GOV.UK

  10. Delta Variant in the COVID-19 Pandemic: A Comparative Study on Clinical Outcomes Based on Vaccination Status

    PMC

+ 3 more sources — see the full list on Lenz

Filed Under

COVID-19 virusDelta variantunvaccinated individualsvaccinated individuals

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