Vaccine Hesitancy: Psychological Determinants, Communication Failures, and Intervention Strategies
Master's Thesis · ~96 pages · English
Abstract
This thesis investigates the psychological, social, and informational determinants of vaccine hesitancy, a phenomenon the World Health Organization has identified as one of the top ten threats to global health. Drawing on health psychology, behavioral economics, and communication theory, the research develops a comprehensive model of hesitancy formation encompassing trust deficits, risk perception biases, social identity processes, and information environment effects. The thesis evaluates intervention strategies including motivational interviewing, trusted messenger approaches, social norm messaging, and structural accessibility improvements, finding that tailored multi-component interventions outperform single-channel communication campaigns.
1. Introduction
Despite vaccines being among the most cost-effective public health interventions ever developed—preventing an estimated 2-3 million deaths annually—hesitancy and refusal represent growing challenges in many countries. The COVID-19 pandemic brought vaccine hesitancy to unprecedented prominence, with acceptance rates varying from over 90% in some countries to below 50% in others.
This thesis examines why people hesitate or refuse vaccines despite strong scientific consensus on their safety and efficacy, and what evidence-based strategies can effectively address hesitancy in diverse population groups.
2. Determinants of Hesitancy
The 3C Model (Complacency, Convenience, Confidence) provides the organizing framework:
Complacency - Low perceived risk of vaccine-preventable diseases, often reflecting successful vaccination programs' own outcomes.
Convenience - Physical, logistical, and financial barriers to vaccine access.
Confidence - Distrust of vaccine safety, efficacy, the healthcare system, or government.
Additional determinants include: • Social influence and community norms • Online misinformation ecosystem effects • Historical medical ethics violations affecting minority communities • Identity-protective cognition and motivated reasoning
3. Intervention Evidence
Meta-analysis of 87 intervention studies reveals differential effectiveness:
• Motivational Interviewing - Most effective for strongly hesitant individuals; requires trained practitioners • Trusted Community Messengers - Healthcare providers and religious leaders outperform government and media sources • Social Norm Messaging - "Most people in your community have been vaccinated" framings effective for mildly hesitant • Presumptive vs. Participatory Announcement - Providers announcing vaccination as expected (vs. asking preferences) increases acceptance by 30% • Structural Accessibility - Mobile clinics, extended hours, and co-location with other services show strong effects
Interventions targeting specific hesitancy profiles (safety concerns vs. convenience barriers) consistently outperform generic campaigns.
References
- [1]MacDonald, N. E., & SAGE Working Group on Vaccine Hesitancy. (2015). Vaccine hesitancy: Definition, scope and determinants. Vaccine, 33(34), 4161-4164.
- [2]Larson, H. J., Jarrett, C., Eckersberger, E., Smith, D. M. D., & Paterson, P. (2014). Understanding vaccine hesitancy around vaccines and vaccination from a global perspective: A systematic review of published literature, 2007-2012. Vaccine, 32(19), 2150-2159.
- [3]Betsch, C., Schmid, P., Heinemeier, D., Korn, L., Holtmann, C., & Böhm, R. (2018). Beyond confidence: Development of a measure assessing the 5C psychological antecedents of vaccination. PLOS ONE, 13(12), e0208601.
- [4]Brewer, N. T., Chapman, G. B., Rothman, A. J., Leask, J., & Kempe, A. (2017). Increasing vaccination: Putting psychological science into action. Psychological Science in the Public Interest, 18(3), 149-207.
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