Within Rumours
When health rumours become dangerous
Health rumours can move from weak reasoning to dangerous action when fear, false causes, and trusted messengers combine.
On this page
- Why health emergencies amplify rumour fallacies
- How trusted community channels can spread false certainty
- What caution looks like before evidence is settled
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Introduction
Pandemics create ideal conditions for rumours. People face uncertainty, fear, rapidly changing guidance, and a strong desire for explanations. In that environment, logical fallacies that might seem harmless in ordinary circumstances can become dangerous. Claims spread because they sound plausible, come from familiar people, or appear to fit existing suspicions, not because they have been verified.
The result is more than confusion. During COVID-19 and other health emergencies, unverified claims influenced treatment decisions, delayed protective actions, increased mistrust of health authorities, and in some cases contributed to injury and death. The World Health Organization (WHO) describes this phenomenon as an “infodemic”: an overabundance of information, including false and misleading claims, that can encourage harmful behaviour and undermine public-health responses. [World Health Organization]WikipediaWorld Health OrganizationThe World Health Organization (WHO) is a specialized agency of the United Nations (UN) which coordinates resp…
Why health emergencies amplify rumour fallacies
Health emergencies place people under pressure to make decisions before complete evidence exists. That pressure strengthens several common fallacies.
A false-cause fallacy appears when people assume that because two events occur together, one must have caused the other. During a pandemic, a recovery after taking a home remedy can be interpreted as proof that the remedy works, even when many other explanations are possible. A hasty generalisation occurs when a small number of anecdotes are treated as evidence for a broad medical claim. An appeal to authority appears when a claim is accepted because a respected figure endorsed it, regardless of whether that person has relevant expertise.
Fear also changes how people evaluate information. Research on pandemic misinformation repeatedly finds that emotionally charged claims travel quickly because they appear to offer certainty in situations where genuine experts are still gathering evidence. WHO and public-health researchers have warned that such information environments can lead people to ignore protective measures, adopt risky behaviours, or lose trust in institutions responsible for managing outbreaks. [World Health Organization]WikipediaWorld Health OrganizationThe World Health Organization (WHO) is a specialized agency of the United Nations (UN) which coordinates resp… [PMC]pmc.ncbi.nlm.nih.govPMCThe impact of misinformation on the COVID-19 pandemicimpact of misinformation on the COVID-19 pandemic - PMCby MMF Caceres · 2022 · Cited by 329 — It has become evident that the internet, so… The logical problem is not merely that a claim is wrong. It is that weak evidence is treated as if it were strong evidence precisely when decisions carry unusually high consequences.
When rumours produce direct physical harm
The clearest examples of pandemic rumour damage involve people acting on false medical claims.
One of the most widely documented cases occurred during the early stages of COVID-19 when rumours circulated that consuming alcohol could kill the virus inside the body. In Iran, these claims contributed to a large outbreak of methanol poisoning. Because methanol is highly toxic and sometimes substituted for drinkable alcohol, thousands of people were poisoned and hundreds died after acting on misinformation presented as health advice. Multiple medical studies describe the episode as a direct consequence of false beliefs about COVID-19 prevention and treatment. [PMC]pmc.ncbi.nlm.nih.govPMCThe impact of misinformation on the COVID-19 pandemicimpact of misinformation on the COVID-19 pandemic - PMCby MMF Caceres · 2022 · Cited by 329 — It has become evident that the internet, so… [PMC]pmc.ncbi.nlm.nih.govPMCThe impact of misinformation on the COVID-19 pandemicimpact of misinformation on the COVID-19 pandemic - PMCby MMF Caceres · 2022 · Cited by 329 — It has become evident that the internet, so…
Researchers studying the outbreak noted that the danger did not arise from a sophisticated conspiracy theory. Instead, it emerged from a chain of weak reasoning:
- Alcohol is used as a disinfectant on surfaces.
- Therefore alcohol must kill the virus inside the body.
- Therefore drinking alcohol should prevent infection.
Each step involved unsupported assumptions, yet the conclusion spread widely enough to affect behaviour. [PMC]pmc.ncbi.nlm.nih.govPMCThe impact of misinformation on the COVID-19 pandemicimpact of misinformation on the COVID-19 pandemic - PMCby MMF Caceres · 2022 · Cited by 329 — It has become evident that the internet, so… ScienceDirect Pandemic misinformation has also been linked to other risky behaviours [sciencedirect.com]sciencedirect.comScienceDirectAlcohol intake in an attempt to fight COVID-19: A medical…by H Aghababaeian · 2020 · Cited by 103 — Hundreds die in Iran…, including excessive consumption of supposed preventative substances, misuse of cleaning products, and avoidance of evidence-based treatments. Reviews of COVID-19 misinformation consistently identify confusion, risk-taking behaviour, and harmful self-treatment as recurring consequences. [World Health Organization]WikipediaWorld Health OrganizationThe World Health Organization (WHO) is a specialized agency of the United Nations (UN) which coordinates resp… [PMC]pmc.ncbi.nlm.nih.govPMCThe impact of misinformation on the COVID-19 pandemicimpact of misinformation on the COVID-19 pandemic - PMCby MMF Caceres · 2022 · Cited by 329 — It has become evident that the internet, so…
How trusted community channels can spread false certainty
Rumours rarely spread because strangers issue anonymous claims. They often travel through channels that people already trust.
Family networks, religious communities, local leaders, workplace groups, neighbourhood forums, and messaging applications can all function as credibility shortcuts. A statement forwarded by a friend may receive less scrutiny than the same statement from an unknown source. In logical terms, trust in the messenger can replace evaluation of the evidence.
This creates a form of false certainty. A claim may appear independently confirmed when it is actually being repeated through interconnected networks. The repetition itself becomes mistaken for verification.
Recent public-health investigations have shown how health misinformation can be amplified by community figures and social institutions. In some cases, false health claims spread through churches, local media outlets, and influential social-media personalities before authorities had an opportunity to respond. The perceived trustworthiness of the source gave the information more persuasive power than the available evidence justified. [Reuters]reuters.comFake rumors, real killings: Inside Congo's deadly health misinformation crisisThe panic led to violence, including the killing of four health workers conducting vaccination surveys. The WHO and Africa Infodemic Resp…
The underlying fallacy is subtle. Trust may be reasonable, but trust is not evidence. Even highly respected community figures can confidently repeat claims that have not been verified.
When rumours damage trust as well as health
The harm caused by pandemic rumours is not limited to individual decisions. Repeated exposure to unsupported claims can alter how communities view public institutions.
WHO reviews of infodemics have found that misinformation contributes to confusion, social distress, and mistrust of health authorities. When people become convinced that official guidance is unreliable or deceptive, they may reject future recommendations regardless of the evidence behind them. [World Health Organization]WikipediaWorld Health OrganizationThe World Health Organization (WHO) is a specialized agency of the United Nations (UN) which coordinates resp… [World Health Organization]WikipediaWorld Health OrganizationThe World Health Organization (WHO) is a specialized agency of the United Nations (UN) which coordinates resp…
This creates a difficult governance problem. Public-health agencies often need to revise recommendations as new evidence emerges. Scientific updates are a normal feature of learning during an outbreak. Rumours, however, can portray those updates as proof that experts are incompetent or dishonest.
The fallacy here is treating uncertainty as evidence of deception. In reality, changing guidance may reflect improved knowledge rather than bad faith. Yet once mistrust becomes established, corrective information faces a much higher barrier.
Research on the COVID-19 infodemic found associations between belief in misinformation, reduced compliance with health guidance, and increased vaccine hesitancy in many settings, although scholars continue to debate the precise strength of these effects and how directly online exposure translates into behaviour. [PMC]pmc.ncbi.nlm.nih.govPMCThe impact of misinformation on the COVID-19 pandemicimpact of misinformation on the COVID-19 pandemic - PMCby MMF Caceres · 2022 · Cited by 329 — It has become evident that the internet, so…
What caution looks like before evidence is settled
Health emergencies require decisions under uncertainty, but uncertainty does not justify certainty without evidence.
A more reliable approach distinguishes between plausible, possible, and established claims. During a developing outbreak:
- A claim may deserve investigation without being accepted as true.
- Anecdotes may justify further research without proving causation.
- Expert disagreement may indicate uncertainty rather than deception.
- Rapid spread may indicate emotional appeal rather than accuracy.
Public-health researchers increasingly emphasise that effective responses to infodemics depend not only on correcting falsehoods but also on helping people evaluate evidence more carefully. The goal is not blind trust in authorities; it is proportioning confidence to the quality of the available evidence. [ScienceDirect]sciencedirect.comScienceDirectAlcohol intake in an attempt to fight COVID-19: A medical…by H Aghababaeian · 2020 · Cited by 103 — Hundreds die in Iran… [ScienceDirect]sciencedirect.comScienceDirectAlcohol intake in an attempt to fight COVID-19: A medical…by H Aghababaeian · 2020 · Cited by 103 — Hundreds die in Iran…
Pandemic rumours become dangerous when logical shortcuts replace that discipline. Fear, urgency, and trusted messengers can make weak claims feel convincing. The real-world harms—from poisonings and delayed treatment to mistrust and social conflict—show that the consequences of faulty reasoning during a health emergency extend far beyond the rumour itself. [World Health Organization]WikipediaWorld Health OrganizationThe World Health Organization (WHO) is a specialized agency of the United Nations (UN) which coordinates resp… [2ajtmh.org]ajtmh.orgarticle p1621.xmlCOVID-19–Related Infodemic and Its Impact on Public Healthby MS Islam · 2020 · Cited by 1551 — Infodemics, often including rumors, stigma…
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Endnotes
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Source: who.int
Link: https://www.who.int/health-topics/infodemicSource snippet
World Health OrganizationInfodemicIt causes confusion and risk-taking behaviours that can harm health. It also leads to mistrust in healt...
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Source: pmc.ncbi.nlm.nih.gov
Title: PMCThe impact of misinformation on the COVID-19 pandemic
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC9114791/Source snippet
impact of misinformation on the COVID-19 pandemic - PMCby MMF Caceres · 2022 · Cited by 329 — It has become evident that the internet, so...
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Source: pmc.ncbi.nlm.nih.gov
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC7251552/Source snippet
Therefore, it is imperative to exert every effort to dispel dangerous and unscientific misinformation...Read more...
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Source: pmc.ncbi.nlm.nih.gov
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC7368655/Source snippet
PMCAlcohol intake in an attempt to fight COVID-19: A medical myth...by H Aghababaeian · 2020 · Cited by 103 — In Iran, methanol poisonin...
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Source: sciencedirect.com
Link: https://www.sciencedirect.com/science/article/abs/pii/S0741832920302500Source snippet
ScienceDirectAlcohol intake in an attempt to fight COVID-19: A medical...by H Aghababaeian · 2020 · Cited by 103 — Hundreds die in Iran...
-
Source: who.int
Link: https://www.who.int/europe/news/item/01-09-2022-infodemics-and-misinformation-negatively-affect-people-s-health-behaviours–new-who-review-findsSource snippet
World Health OrganizationInfodemics and misinformation negatively affect people's...1 Sept 2022 — The systematic review found that peopl...
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Source: pmc.ncbi.nlm.nih.gov
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC9421549/Source snippet
and health misinformation: a systematic review of...by IJB do Nascimento · 2022 · Cited by 708 — This phenomenon, called an infodemic, i...
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Source: reuters.com
Title: Fake rumors, real killings: Inside Congo’s deadly health misinformation crisis
Link: https://www.reuters.com/business/media-telecom/fake-rumors-real-killings-inside-congos-deadly-health-misinformation-crisis-2026-05-07/Source snippet
The panic led to violence, including the killing of four health workers conducting vaccination surveys. The WHO and Africa Infodemic Resp...
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Source: reuters.com
Title: Disease, misinformation threaten health workers This Reuters newsletter from
Link: https://www.reuters.com/sustainability/disease-misinformation-threaten-health-workers-2026-05-07/Source snippet
In Tenerife, Spain, healthcare professionals are concerned about a potential outbreak of Andes hantavirus aboard the MV Hondius cruise sh...
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Source: sciencedirect.com
Link: https://www.sciencedirect.com/science/article/pii/S2468266724000318Source snippet
Examples of...
-
Source: sciencedirect.com
Link: https://www.sciencedirect.com/science/article/abs/pii/S1473309924001051Source snippet
Social histories of public health misinformation and...by SL Jin · 2024 · Cited by 44 — Public health authorities continue to [experience]({{ 'experience/' | relative_url }})...
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Source: ajtmh.org
Title: article p1621.xml
Link: https://www.ajtmh.org/view/journals/tpmd/103/4/article-p1621.xmlSource snippet
COVID-19–Related Infodemic and Its Impact on Public Healthby MS Islam · 2020 · Cited by 1551 — Infodemics, often including rumors, stigma...
-
Source: who.int
Link: https://www.who.int/ -
Source: emro.who.int
Link: https://www.emro.who.int/emhj-volume-28-2022/volume-28-issue-2/motivations-for-alcohol-consumption-during-the-covid-19-pandemic-in-islamic-republic-of-iran.htmlSource snippet
for alcohol consumption during the COVID-19...by A Fattah · 2022 · Cited by 4 — From 7 March to 8 April 2020, methanol poisoning was rep...
Published: April 2020
-
Source: who.int
Title: WH O’s response to hantavirus cases linked to a cruise ship
Link: https://www.who.int/news/item/07-05-2026-who-s-response-to-hantavirus-cases-linked-to-a-cruise-ship -
Source: who.int
Link: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public/myth-bustersSource snippet
COVID-19 MythbustersAn alcohol-based sanitizer does not create antibiotic resistance. Unlike other antiseptics and antibiotics, pathogens...
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Source: who.int
Link: https://www.who.int/news/item/23-09-2020-managing-the-covid-19-infodemic-promoting-healthy-behaviours-and-mitigating-the-harm-from-misinformation-and-disinformationSource snippet
Managing the COVID-19 infodemic: Promoting healthy...23 Sept 2020 — It includes deliberate attempts to disseminate wrong information to...
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Source: reuters.com
Title: KL M flight attendant tested negative for hantavirus infection, WHO says
Link: https://www.reuters.com/business/healthcare-pharmaceuticals/klm-flight-attendant-tested-negative-hantavirus-infection-who-says-2026-05-08/ -
Source: sciencedirect.com
Link: https://www.sciencedirect.com/org/science/article/pii/S2292949521000055Source snippet
Prevalence of Misinformation and Factchecks on the...by M Cha · 2021 · Cited by 51 — We conducted an online survey via [social media]({{ 'social-media/' | relative_url }}) plat...
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Source: sciencedirect.com
Link: https://www.sciencedirect.com/science/article/abs/pii/S073567572100930XSource snippet
Visual disturbances in patients with acute methanol poisoning: a cross-sectional study: acute...
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Source: Wikipedia
Title: COVID 19 misinformation
Link: https://en.wikipedia.org/wiki/COVID-19_misinformationSource snippet
COVID-19 misinformationFalse information, including disinformation and conspiracy theories about the scale of the COVID-19 pandemic an...
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Source: Wikipedia
Title: World Health Organization
Link: https://en.wikipedia.org/wiki/World_Health_OrganizationSource snippet
World Health OrganizationThe World Health Organization (WHO) is a specialized agency of the United Nations (UN) which coordinates resp...
-
Source: youtube.com
Link: https://www.youtube.com/channel/UC07-dOwgza1IguKA86jqxNASource snippet
official public health information Youtube...Read more...
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Source: instagram.com
Link: https://www.instagram.com/who/Source snippet
remove hate speech & mis-disinformation...
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Source: facebook.com
Link: https://www.facebook.com/WHO/Source snippet
World Health Organization (WHO) | GenevaWorld Health Organization (WHO), Geneva. 37250898 likes · 31672 talking about this · 142077 were...
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Source: x.com
Title: World Health Organization (WHO)We are the UN’s health agency
Link: https://x.com/WHOSource snippet
#HealthForAll. Always check our latest tweets for updated advice/information. We will respond to mis-and-disinformation...
Additional References
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Source: researchgate.net
Link: https://www.researchgate.net/publication/396248635_Alcohol_poisoning_in_the_shadow_of_a_COVID-19_pandemic_a_5-year_review_of_methanolethanol_toxicity_in_Northern_IranSource snippet
Alcohol poisoning, in the shadow of a COVID-19 pandemicAlcohol poisoning, in the shadow of a COVID-19 pandemic: a 5-year review of methan...
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Source: newswise.com
Link: https://www.newswise.com/articles/as-covid-19-and-online-misinformation-spread-children-and-teens-were-poisoned-with-hand-sanitizer-and-alcoholic-drinksSource snippet
As COVID-19 and Online Misinformation Spread, Children...Sep 8, 2021 — Misinformation circulating on social media included the false sug...
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Source: ballardbrief.byu.edu
Title: the effects of medical misinformation on the american public
Link: https://ballardbrief.byu.edu/issue-briefs/the-effects-of-medical-misinformation-on-the-american-publicSource snippet
Effects of Medical Misinformation on the American Public15 Mar 2024 — Medical misinformation causes higher rates of death and negative he...
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Source: abc.net.au
Title: hundreds dead in iran after drinking methanol to cure virus
Link: https://www.abc.net.au/news/2020-04-28/hundreds-dead-in-iran-after-drinking-methanol-to-cure-virus/12192582Source snippet
Hundreds die in Iran over false belief drinking methanol...27 Apr 2020 — Health workers in Iran are warning people to not fall for coron...
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Source: cpha.ca
Link: https://www.cpha.ca/finding-public-healths-voice-infodemicSource snippet
ncluding false or misleading information in digital and physical...Read more...
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Source: pmc.ncbi.nlm.nih.gov
Title: PMCA syndemic of COVID-19 and methanol poisoning in Iran
Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC7272173/Source snippet
Keywords: alcohol policy, Iran, methanol poisoning, prevention, public health models...Read more...
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Source: societyofeditors.org
Link: https://www.societyofeditors.org/soe_news/full-fact-we-dont-know-whether-misinformation-killed-800-people/Source snippet
We don't know whether “misinformation” killed 800 peopleAug 20, 2020 — The figure of 800 comes almost entirely from alcohol poisoning deaths...
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Source: d-nb.info
Title: In methanol poisoning, the efficacy of tr
Link: https://d-nb.info/1217232400/34Source snippet
methanol outbreak in the wake of the COVID-19 pandemic...by H Hassanian-Moghaddam · 2020 · Cited by 100 — to human lives [4], as health...
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Source: m.dongascience.com
Link: https://m.dongascience.com/en/news/39006Source snippet
dongascience.com800 Deaths Between Jan-March Linked to COVID-19 Fake...Aug 13, 2020 — This [fake news]({{ 'fake-news/' | relative_url }}) often gained credibility by disguis...
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Source: researchgate.net
Title: (PDF) Methanol Mass Poisoning Outbreak
Link: https://www.researchgate.net/publication/342986329_Methanol_Mass_Poisoning_Outbreak_A_Consequence_of_COVID-19_Pandemic_and_Misleading_Messages_on_Social_MediaSource snippet
misinformation regarding the alleged protective effects of alcohol against... poisoning during COVID-19 pandemic: a multicenter study of...
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