Vaccine hesitancy
Atomic claims
### Vaccine hesitancy
### Summary
Vaccine hesitancy is the delay in accepting, or the refusal of, vaccination despite the availability of vaccination services.
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It ranges from acceptance with doubts to outright refusal, and varies by vaccine, place, and time.
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Researchers attribute it to several interacting factors, including confidence in vaccines and institutions, perceived disease risk, and practical barriers.
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Written from recall of public sources without live verification; figures should be checked against the cited originals.
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### Key facts
- The WHO SAGE Working Group defined hesitancy as delay in acceptance or refusal despite available services, and described it as complex and context-specific.
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[source: MacDonald et al., Vaccine 33(34), 2015]
- The same group proposed the "3 Cs" model of confidence, complacency, and convenience.
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[source: MacDonald et al., 2015]
- A later "5C" scale covers confidence, complacency, constraints, calculation, and collective responsibility.
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[source: Betsch et al., PLOS ONE, 2018]
- WHO listed vaccine hesitancy among ten threats to global health in 2019.
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[source: WHO, "Ten threats to global health in 2019", 2019]
- Organised opposition dates to at least the 1850s, when anti-vaccination leagues formed in England after the compulsory Vaccination Act of 1853.
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An 1898 Act introduced a conscience clause.
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[source: Wolfe & Sharp, BMJ 325:430, 2002]
- In the 1970s, after safety allegations about whole-cell pertussis vaccine, UK coverage fell from about 81% to about 31%, followed by pertussis epidemics.
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[source: Gangarosa et al., Lancet 351:356, 1998]
- A 1998 Lancet paper by Wakefield et al.
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suggesting a link between MMR vaccine and autism was retracted in February 2010.
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[source: Lancet editors, retraction notice, 2010]
- The BMJ characterised that paper as fraudulent.
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[source: Godlee et al., BMJ 342:c7452, 2011]
- A Danish cohort study of 657,461 children found no increased autism risk after MMR vaccination.
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[source: Hviid et al., Annals of Internal Medicine, 2019]
- Northern Nigerian states suspended polio vaccination in 2003–04 amid rumours the vaccine caused infertility.
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[source: Jegede, PLoS Medicine 4(3):e73, 2007]
- In a 140-country survey, 79% of respondents agreed vaccines are safe.
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[source: Wellcome Global Monitor 2018, published 2019]
- In the Philippines, the share strongly agreeing that vaccines are important fell from 93% in 2015 to 32% in 2018, after the Dengvaxia controversy.
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[source: Larson et al., Human Vaccines & Immunotherapeutics, 2019]
- A June 2020 survey of 13,426 people in 19 countries found 71.5% were likely to accept a COVID-19 vaccine.
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[source: Lazarus et al., Nature Medicine 27, 2021]
- Perception of the importance of childhood vaccines declined in 52 of 55 countries studied during the COVID-19 pandemic.
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[source: UNICEF, State of the World's Children 2023]
- In the 2023–24 US school year, kindergarten MMR coverage was 92.7% and exemptions were 3.3%, the highest exemption rate then recorded.
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[source: Seither et al., CDC MMWR, October 2024]
- In Samoa's 2019 measles outbreak, there were about 5,700 cases and 83 deaths.
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Infant measles vaccine coverage had fallen to roughly 31% in 2018.
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[source: WHO/UNICEF coverage estimates; Government of Samoa situation reports, 2019–20]
- A systematic review found no single intervention strategy that addresses all hesitancy.
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Multicomponent and dialogue-based approaches performed best, and the evidence quality was low.
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Global health authorities have identified vaccine hesitancy as a major threat to public health.
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Vaccine hesitancy is a complex behavioral phenomenon.
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Vaccine hesitancy is driven by variables including lack of confidence in vaccine safety, complacency toward disease risks, and barriers to physical access.
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Vaccine hesitancy has contributed to the resurgence of preventable infectious diseases.
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Vaccine hesitancy poses ongoing challenges for global immunization campaigns.
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The World Health Organization's Strategic Advisory Group of Experts (SAGE) defines vaccine hesitancy as a "delay in acceptance or refusal of vaccines despite availability of vaccination services."
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SAGE categorizes the primary drivers of vaccine hesitancy using the "3 Cs" model.
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The three components of the "3 Cs" model are Confidence, Complacency, and Convenience.
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In the "3 Cs" model, Confidence refers to trust in the safety and efficacy of vaccines and in the healthcare system.
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In the "3 Cs" model, Complacency refers to perceived low risk of the vaccine-preventable disease.
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In the "3 Cs" model, Convenience refers to physical, financial, and geographical accessibility.
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In 2019, the World Health Organization designated vaccine hesitancy as one of the top ten threats to global health.
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Historical resistance to vaccines dates back to the 19th century.
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The Anti-Vaccination League was formed in the United Kingdom following the Vaccination Act of 1853.
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The Vaccination Act of 1853 mandated smallpox vaccination for infants.
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In 1998, Andrew Wakefield and colleagues published a paper in The Lancet positing a link between the measles, mumps, and rubella (MMR) vaccine and autism.
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The 1998 Wakefield paper was a significant modern driver of vaccine hesitancy.
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The Lancet fully retracted the 1998 Wakefield paper in 2010.
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The retraction of the 1998 Wakefield paper followed investigations that revealed data falsification.
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Multiple large-scale epidemiological meta-analyses have consistently found no link between vaccines and autism.
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Epidemiologists have linked decreased vaccination coverage due to localized hesitancy and refusal to resurgences of preventable diseases.
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Significant measles outbreaks occurred in the United States during the 2010s and have been linked to decreased vaccination coverage.
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During the COVID-19 pandemic, vaccine hesitancy was widely reported to be correlated with demographic and ideological factors.
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Researchers widely report that social media algorithms amplify anti-vaccine misinformation.
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Amplification of anti-vaccine misinformation online allows unverified claims about adverse effects to proliferate rapidly.
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Government or employer-issued vaccine mandates have been implemented for purposes such as school attendance, international travel, and continued employment.
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The use of vaccine mandates to counter hesitancy is highly contested politically and legally.
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Vaccine skeptics frequently cite the profit motives of the pharmaceutical industry as a rationale for their hesitancy.
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Vaccine-hesitant groups actively dispute the claim that regulatory oversight and clinical trials mitigate pharmaceutical industry conflicts of interest.
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Proponents argue that vaccine mandates are a necessary, legally established public health tool to achieve herd immunity and protect vulnerable populations.
Opponents argue that vaccine mandates violate bodily autonomy, informed consent, and constitutional liberties.
Public health officials and vaccine proponents argue that rigorous, independent regulatory oversight by agencies such as the FDA or EMA mitigates pharmaceutical industry conflicts of interest.
External references: Wikidata Q56641686