DoubleChecks

What was claimed

CDC's own study said it captures fewer than 1 percent of vaccine injuries. It's worthless

Our verdict

Inaccurate

VAERS has limitations, including underreporting and reports without confirmed causation, but it is used as an early-warning system alongside other monitoring programs. Recent evidence indicates substantially higher reporting rates for serious events such as anaphylaxis and Guillain-Barré syndrome. A 2007–2010 study reported that fewer than 1 percent of vaccine adverse events were reported to VAERS. It did not establish that fewer than 1 percent of confirmed vaccine-caused injuries were captured, and adverse events after vaccination are not necessarily caused by vaccines.

Combined assessment16 sourcesChecked Oct 16, 2026

Why this verdict

  • VAERS is worthless

    Incorrect
    One assessment reached this conclusion

  • The system is worthless.

    Incorrect
    One assessment reached this conclusion; one differed·ChatGPT: Can’t verify

  • "CDC's own study said it captures fewer than 1 percent of vaccine injuries."

    Misleading
    All assessments reached this conclusion

Evidence reviewed

16 sources

Perplexity, Claude and ChatGPT sources are combined here.

todayville.comfactcheck.afp.comnaturalnews.commediabiasfactcheck.comdownloads.regulations.govfactcheck.orgpolitifact.comvaxopedia.orgpublic-inspection.federalregister.govreuters.com

Individual assessments

Assessment summary

  • The statement uses a real older finding but overstates what it means.
  • The study concerned reports of adverse events, including mild events, not confirmed vaccine injuries, and serious events are reported at much higher rates.todayville.com factcheck.afp.com

Claims reviewed

The system is worthless.

Incorrect
VAERS has limitations, including underreporting and reports without confirmed causation, but it is used as an early-warning system alongside other monitoring programs.todayville.com factcheck.afp.com Recent evidence indicates substantially higher reporting rates for serious events such as anaphylaxis and Guillain-Barré syndrome.factcheck.afp.com

This claim may mislead readers without added context.

A CDC study said fewer than 1 percent of vaccine injuries are captured.

Misleading
A 2007–2010 study reported that fewer than 1 percent of vaccine adverse events were reported to VAERS.todayville.com It did not establish that fewer than 1 percent of confirmed vaccine-caused injuries were captured, and adverse events after vaccination are not necessarily caused by vaccines.todayville.com factcheck.afp.com

This claim may mislead readers without added context.

Assessment summary

  • The claim contains a kernel of truth—a CDC-funded study did find fewer than 1% reporting for some vaccine adverse events.
  • However, this figure applies specifically to non-serious events like rashes, not all vaccine injuries.
  • Serious adverse events show capture rates of 12-76% depending on the event type.
  • The claim is misleading because it presents a partial truth as a universal statement and draws an unsupported conclusion about VAERS being "worthless."

Claims reviewed

VAERS is worthless

Incorrect
VAERS captures serious adverse events at meaningful rates (12-76% for specific serious conditions). The system is recognized as useful for detecting safety signals, particularly for serious events, despite limitations in capturing minor adverse events.

This claim may mislead readers without added context.

CDC's own study said it captures fewer than 1 percent of vaccine injuries

Misleading
A CDC-funded Harvard study did find 'fewer than 1%' reporting, but this applied to non-serious events like rashes, not all vaccine injuries. Serious adverse events show capture rates of 12-76% depending on the event type and vaccine.

This claim may mislead readers without added context.

Assessment summary

  • The statement mixes a partly-accurate numerical claim with a value judgment.
  • There is evidence that some analyses found VAERS reporting sensitivity can be very low (under 1%) for certain kinds of events digital.ahrq.gov pubmed.ncbi.nlm.nih.gov.
  • However, the claim omits key context about which events are underreported, who did the study, and CDC/HHS caveats, and the conclusion "It's worthless" is an opinion, not a verifiable fact factcheck.org.

Claims reviewed

"CDC's own study said it captures fewer than 1 percent of vaccine injuries."

Misleading
Studies have found reporting sensitivity to VAERS can be under 1% for some specific outcomes (e.g., rash after MMR) digital.ahrq.gov pubmed.ncbi.nlm.nih.gov. A 2011 HHS-funded (Harvard Pilgrim) report is often cited as concluding fewer than 1% of vaccine adverse events are reported, but this finding depends on event type and methodology, and it is not a simple CDC blanket statement that VAERS captures <1% of all vaccine injuries pubmed.ncbi.nlm.nih.gov factcheck.org.

This claim may mislead readers without added context.

"It's worthless."

Can’t verify
"Worthless" is an evaluative judgment, not an empirical claim; whether VAERS is "worthless" depends on how one uses it. Public-health agencies treat VAERS as a signal-detection tool (not a measure of incidence) and still rely on it to detect safety signals that are then studied with other methods factcheck.org.

Check your own claim

Paste any statement, headline, or AI answer. Independent assessments check it and compare sources.

Share this result