Personalized feedback about immunity corrects risk misestimation and motivates vaccination

Area of Science:

• Psychology
• Public Health
• Behavioral Science

Background:

• Beliefs about personal immunity influence health behaviors like vaccination and preventative care.
• Low uptake of COVID-19 vaccines highlights a need for interventions addressing immunity misconceptions.
• Overestimating protection can lead to neglect of crucial health measures.

Purpose of the Study:

• To test psychological interventions aimed at correcting immunity beliefs and increasing vaccination.
• To compare the effectiveness of a personalized feedback intervention with a standard public health message.
• To assess the durability of belief changes and impact on vaccine uptake.

Main Methods:

• An online study with 882 participants tested personalized immunity belief interventions.
• Participants received tailored feedback on their likely protection against COVID-19.
• Intervention effectiveness was compared to a national public health organization's message.
• The intervention was later deployed on a public website and replicated in a separate sample (n=553).

Main Results:

• The personalized intervention effectively altered immunity beliefs and vaccination intentions.
• Personalized feedback significantly realigned perceived risk (d=0.35), unlike the standard message (d=-0.03).
• Belief changes persisted for two months, with self-reported vaccine uptake 2-14 times higher than the national rate.
• The intervention showed particular efficacy among older adults.

Conclusions:

• Psychological interventions targeting immunity beliefs can effectively motivate vaccination.
• Personalized feedback is a promising strategy for improving public health behaviors.
• Findings are relevant for COVID-19, influenza, and future pandemic preparedness.