Vaccine hesitancy and vaccine safety concerns

Vaccine hesitancy refers to delay in acceptance or refusal of vaccines despite availability. The WHO identified vaccine hesitancy as one of the top 10 threats to global health. While vaccine hesitancy is not new, contemporary anti-vaccination sentiment is paradoxically concentrated in wealthy, highly educated democracies—populations that have historically experienced improved health outcomes.

Vaccine hesitancy is multifactorial, driven by access barriers (affordability, availability), awareness gaps (education about vaccine importance), and acceptance challenges (safety concerns, religious or philosophical objections). In recent years, misinformation and disinformation campaigns on social media have become major drivers of vaccine skepticism, particularly surrounding vaccine safety.

Key factors influencing vaccine hesitancy

Socioeconomic determinants: Education level, income, access to healthcare infrastructure

Psychological factors: Risk perception, trust in institutions, confirmation bias, susceptibility to fringe narratives

Social and network effects: Ideological homophily, influence of trusted community members, peer networks

Platform dynamics: Social media algorithms, coordinated disinformation campaigns, ease of content creation and virality

Deliberate disinformation: Foreign state-sponsored anti-vaccination campaigns targeting Western populations; domestic anti-vaccination activist networks

Related concepts

• Disinformation — deliberately false information about vaccine safety
• Misinformation — false or misleading health information, intentionally or otherwise
• Social media and misinformation — platform role in spreading vaccine skepticism
• COVID-19 misinformation — vaccine hesitancy accelerated during pandemic
• Psychology of belief formation and persistence

Key resources

• Jevin West — Misinformation and Data Literacy — discusses vaccine-related misinformation and other false health claims (Ayurvedic cures, fluoridation myths) propagated through search engines and recommendation algorithms; emphasizes the role of literacy interventions

Key papers in this wiki

• Suarez-Lledo & Alvarez-Galvez (2021) — Prevalence of Health Misinformation on Social Media: Systematic Review — systematic review of 69 studies identifying vaccine misinformation as the most prevalent health topic (32% of studies); characterizes prevalence across platforms and analytical approaches
• Roozenbeek et al. (2020) — Susceptibility to misinformation about COVID-19 around the world — international survey showing susceptibility to COVID-19 misinformation directly predicts lower willingness to get vaccinated and reduced compliance with health guidance across five countries.
• Bode & Vraga (2015) — In Related News, That Was Wrong: The Correction of Misinformation Through Related Stories Functionality in Social Media — experimental test of correcting vaccine-autism misinformation via social media; shows related debunking stories did not significantly reduce vaccine-autism misperceptions, suggesting this misconception is particularly resistant to algorithmic correction relative to GMO claims
• Wilson & Wiysonge (2020) — Social media and vaccine hesitancy — large-scale cross-national study (137–166 countries) showing social media organization activity predicts vaccine safety skepticism; foreign disinformation campaigns associated with declining vaccination coverage

Open challenges

• How can public health messaging overcome vaccine hesitancy rooted in social media echo chambers?
• What are the most effective interventions against state-sponsored anti-vaccination disinformation?
• How do platform algorithms amplify vaccine skepticism, and what role should platforms play in content moderation?
• How does vaccine hesitancy vary across cultural and political contexts, and what drives regional differences?
• What is the causal relationship between social media exposure and vaccine refusal behavior?