4.7 Review

First COVID-19 Booster Dose in the General Population: A Systematic Review and Meta-Analysis of Willingness and Its Predictors

Journal

VACCINES
Volume 10, Issue 7, Pages -

Publisher

MDPI
DOI: 10.3390/vaccines10071097

Keywords

COVID-19; vaccination; booster dose; willingness; refusal; predictors

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This systematic review and meta-analysis investigated the acceptance of COVID-19 booster doses among fully vaccinated individuals and its associated factors. The study found that 79.0% of individuals intended to accept a booster, 12.6% were unsure, and 14.3% intended to refuse. Older age, previous flu vaccination, and confidence in COVID-19 vaccination were the main predictors of willingness. The main reasons for refusal were adverse reactions and concerns for serious adverse reactions. A high acceptance rate of booster doses could play a critical role in controlling the COVID-19 pandemic.
The emergence of breakthrough infections and new highly contagious variants of SARS-CoV-2 threaten the immunization in individuals who had completed the primary COVID-19 vaccination. This systematic review and meta-analysis investigated, for the first time, acceptance of the first COVID-19 booster dose and its associated factors among fully vaccinated individuals. We followed the PRISMA guidelines. We searched Scopus, Web of Science, Medline, PubMed, ProQuest, CINAHL and medrxiv from inception to 21 May 2022. We found 14 studies including 104,047 fully vaccinated individuals. The prevalence of individuals who intend to accept a booster was 79.0%, while the prevalence of unsure individuals was 12.6%, and the prevalence of individuals that intend to refuse a booster was 14.3%. The main predictors of willingness were older age, flu vaccination in the previous season, and confidence in COVID-19 vaccination. The most important reasons for decline were adverse reactions and discomfort experienced after previous COVID-19 vaccine doses and concerns for serious adverse reactions to COVID-19 booster doses. Considering the burden of COVID-19, a high acceptance rate of booster doses could be critical in controlling the pandemic. Our findings are innovative and could help policymakers to design and implement specific COVID-19 vaccination programs in order to decrease booster vaccine hesitancy.

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