Vaccine Hesitancy and Public Confidence

Vaccine hesitancy is the delay in acceptance or refusal of vaccines despite the availability of vaccination services. It sits on a continuum between full acceptance and outright refusal, varies across vaccines, time, and place, and is shaped by confidence in vaccines, perceived complacency about disease risk, and the convenience of services.

Definition

Vaccine hesitancy is the delay in acceptance or refusal of vaccination despite available services; it is context-specific and influenced by confidence, complacency, and convenience.

Scope

This topic covers the definition and measurement of vaccine hesitancy, the determinants that drive it, the related concept of vaccine confidence, and how these are studied across populations. It is a behavioural and social-science reference within population vaccinology and does not provide communication scripts or individualized counselling advice.

Core questions

• How is vaccine hesitancy defined and distinguished from outright refusal?
• What determinants drive hesitancy across different settings?
• How is hesitancy measured, and how stable are such measures?
• What is meant by vaccine confidence and how does it relate to hesitancy?

Key concepts

• Continuum from acceptance to refusal
• Confidence, complacency, convenience (3Cs)
• Vaccine confidence and trust
• Context-specificity of hesitancy
• Hesitancy measurement scales
• Misinformation and information environment

Key theories

The 3Cs model of hesitancy

A widely cited framework characterizes vaccine hesitancy as arising from confidence (trust in vaccines, providers, and systems), complacency (low perceived risk of disease), and convenience (the ease of accessing vaccination), providing a structured way to describe its determinants.

Mechanisms

Hesitancy is understood as a continuum rather than a binary choice, and the same person may accept some vaccines while hesitating over others. Determinants are commonly organized around confidence, complacency, and convenience: erosion of trust in vaccines or institutions, a perception that disease risk is low, and barriers that make vaccination inconvenient all push individuals toward delay or refusal. Because attitudes are shaped by the surrounding information environment and by social and cultural context, hesitancy is specific to time and place and can shift rapidly, which is why dedicated survey instruments are used to detect and track it.

Clinical relevance

Recognizing the determinants of hesitancy helps explain variation in uptake that is not accounted for by access alone, and it is relevant to interpreting coverage data. This topic describes hesitancy as a studied phenomenon and is reference material; it does not prescribe how to counsel an individual or run a communication campaign.

Epidemiology

Systematic review of the global literature has documented vaccine hesitancy across many countries and vaccines, with determinants varying by setting, and the concept of a measurable vaccine confidence gap has been used to monitor changes in public trust over time.

Evidence & guidelines

The WHO SAGE Working Group on Vaccine Hesitancy provided the influential definition and the 3Cs framing used widely in the field; validated survey instruments such as parent-attitude scales support measurement. These are cited descriptively and not as operational guidance.

History

Concern about vaccine acceptance is as old as vaccination itself, but the modern study of hesitancy crystallized in the 2010s when the WHO SAGE working group defined the term and proposed the 3Cs framework, and when systematic reviews and confidence-monitoring projects began to map its determinants globally.

Debates

Is hesitancy best framed as an individual attitude or a systemic trust problem?

Some frame hesitancy primarily as individual beliefs amenable to information, while others emphasize structural erosion of confidence in vaccines, providers, and institutions; the framing shapes how the phenomenon is measured and interpreted.

Key figures

• Noni MacDonald
• Heidi Larson
• Douglas Opel

Seminal works

• macdonald-2015
• larson-2014
• larson-2011

Frequently asked questions

Is vaccine hesitancy the same as anti-vaccine refusal?

No. Hesitancy is a continuum that includes people who delay or are uncertain but may still accept vaccination; outright refusal is one end of that spectrum rather than the whole of it.

Why does hesitancy differ between countries and over time?

Hesitancy is context-specific, driven by confidence, complacency, and convenience that vary with local trust, perceived disease risk, service access, and the information environment, so its level and causes shift across settings and years.