The main research results are presented below. The key terms used here are ‘willingness to be vaccinated’ and ‘participation in vaccination’. This means that a person intends and is willing to be vaccinated (willingness to be vaccinated) and whether a person has actually been vaccinated (participation in vaccination, also referred to as vaccine uptake).

Thinking and feeling

• More positive or negative thoughts or feelings are correlated to higher or lower willingness to be vaccinated and participation in vaccination. 
• Topics that people consider in making this choice include vaccine safety, benefits and effectiveness, disease risks, and confidence in the healthcare system and experts.

Social processes

• What people see as socially acceptable affects their willingness to be vaccinated and participation in vaccination.
• Viewing vaccination as a social responsibility, knowing more about the vaccine or disease, information from official sources, and advice from a health worker are correlated to higher willingness to be vaccinated and participation in vaccination.
• Certain cultural norms and beliefs, language and religion, insufficient knowledge, inaccurate information, information from non-official sources, and failure to receive advice from a health worker are correlated to lower willingness to be vaccinated and participation in vaccination.

Ease of access

• The ease of access to vaccines involves various aspects, such as personal obstacles, affordability, or quality of the vaccination service.
• More accessible communication and fewer obstacles are correlated to higher willingness to be vaccinated and participation in vaccination.

What people do

• Previous behaviour may also play a role: previous vaccinations and proactive behaviour (such as a recent visit to a care provider) are correlated to higher willingness to be vaccinated and participation in vaccination.

Demographic features

• The literature does not indicate any clear overall impression of demographic features.