DoubleChecks

What was claimed

Polio was pesticide and arsenic poisoning (not a virus). High dose vitamin C cured it. The vaccine causes polio. CDC redefined polio to make it look like vaccines reduced cases. It was never person-to-person.

Our verdict

Inaccurate

CDC and WHO identify polio as a viral disease caused by poliovirus. Fact-checks also state there is no evidence that pesticides or arsenic caused polio. Public health sources describe vaccine-era case declines as due to vaccination, not a CDC redefinition. The claim appears in fringe sources but is not supported by authoritative evidence.

All 3 AI systems agree16 sources citedChecked Jul 21, 2026

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Key findings

CDC redefined polio to make it look like vaccines reduced cases.

Incorrect89%
All 3 AIs agree

Polio was pesticide and arsenic poisoning (not a virus).

Incorrect98%
All 3 AIs agree

Polio was never person-to-person.

Incorrect98%
All 3 AIs agree

The vaccine causes polio.

Misleading88%
2 of 3 AIs agree·Perplexity: Incorrect

High dose vitamin C cured polio.

Can’t verify63%
2 of 3 AIs agree·Perplexity: Incorrect

Verified against 16 sources

harvoa.org21stcenturywire.comfactcheck.orgpoliokit.orgusatoday.commedcraveebooks.comageofautism.comchildrenshealthdefense.orgpolymathicbeing.comen.scibook.orgpublichealthcollaborative.orgx.comvaclib.orgscribd.comscribd.compubmed.ncbi.nlm.nih.gov

Detailed Analysis

The response makes several major claims that are directly contradicted by authoritative public health sources. CDC, WHO, and fact-checking organizations state that polio is caused by poliovirus, spreads person-to-person, and was reduced by vaccination, not by a CDC redefinition or by vitamin C cures.

Why this verdict

  • The response makes several major claims that are directly contradicted by authoritative public health sources.
  • CDC, WHO, and fact-checking organizations state that polio is caused by poliovirus, spreads person-to-person, and was reduced by vaccination, not by a CDC redefinition or by vitamin C cures.

Claims checked

CDC redefined polio to make it look like vaccines reduced cases.

Incorrect96%
Public health sources describe vaccine-era case declines as due to vaccination, not a CDC redefinition. The claim appears in fringe sources but is not supported by authoritative evidence.

This claim may mislead readers without added context.

High dose vitamin C cured polio.

Incorrect97%
The supplied sources do not support this, and mainstream medical references do not recognize vitamin C as a cure for polio. The claim is presented in fringe sources only.

This claim may mislead readers without added context.

The vaccine causes polio.

Incorrect98%
Inactivated polio vaccines do not cause polio, and vaccination is credited with preventing the disease. Oral polio vaccine can rarely cause vaccine-derived polio, but that is not the same as saying 'the vaccine causes polio' in general.

This claim may mislead readers without added context.

What other AI think

The response contains multiple significant factual errors contradicted by extensive scientific evidence. Polio is definitively caused by a virus (poliovirus), not pesticide or arsenic poisoning. The disease is clearly person-to-person transmissible. While rare adverse events from the oral vaccine exist, the inactivated vaccine used in the US does not cause polio. No credible evidence supports the pesticide theory or CDC redefinition claims.

Why this verdict

  • The response contains multiple significant factual errors contradicted by extensive scientific evidence.
  • Polio is definitively caused by a virus (poliovirus), not pesticide or arsenic poisoning.
  • The disease is clearly person-to-person transmissible.
  • While rare adverse events from the oral vaccine exist, the inactivated vaccine used in the US does not cause polio.

Claims checked

CDC redefined polio to make it look like vaccines reduced cases

Incorrect85%
Wild poliovirus cases have decreased by over 99% since 1988, from an estimated 350,000 cases in more than 125 endemic countries to 6 reported cases in 2021. This dramatic decline is documented across multiple independent health organizations (WHO, CDC, ECDC), making a coordinated redefinition conspiracy implausible.

This claim may mislead readers without added context.

Polio was pesticide and arsenic poisoning (not a virus)

Incorrect99%
Polio is an acute clinical disease caused by a poliovirus. Multiple authoritative sources confirm poliovirus as the causative agent. No credible scientific evidence supports a pesticide or arsenic poisoning theory.

This claim may mislead readers without added context.

It was never person-to-person

Incorrect99%
The principal mode of transmission is person-to-person by the fecal-oral route. The poliovirus is contagious and transmissible from person-to-person. Person-to-person transmission is well-established across all medical literature.

This claim may mislead readers without added context.

Most statements are factually incorrect and contradict established public-health evidence. Several claims ignore well-documented virology, transmission, and vaccine science, and are therefore misleading or false.

Why this verdict

  • Most statements are factually incorrect and contradict established public-health evidence.
  • Several claims ignore well-documented virology, transmission, and vaccine science, and are therefore misleading or false.

Claims checked

CDC redefined polio to make it look like vaccines reduced cases.

Incorrect85%
There is no evidence that CDC changed definitions to conceal vaccine effects; surveillance and case definitions have evolved for laboratory confirmation and detection of vaccine‑derived versus wild poliovirus, not to fraudulently reduce reported cases.

This claim may mislead readers without added context.

Polio was pesticide and arsenic poisoning (not a virus).

Incorrect95%
Poliomyelitis is caused by the poliovirus, a well-characterized enterovirus; major public-health agencies (WHO, CDC) identify poliovirus as the cause, not chemical poisoning.

This claim may mislead readers without added context.

It was never person-to-person.

Incorrect95%
Poliovirus is transmitted person‑to‑person, primarily via the fecal‑oral route and sometimes oral‑oral, as documented by WHO, CDC, and infectious disease texts.

This claim may mislead readers without added context.

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