A Systematic Review on COVID-19 Vaccine preferences using Discrete Choice Experiments

ObjectiveTo determine the attributes of COVID-19 vaccines that influence vaccine acceptance using a DCE through a systematic review. MethodsA systematic search was carried out for articles published up to November 2021 in the PubMed, Psycinfo, Embase, Web of Science, and Global Index Medicus databases. The electronic search algorithm consisted of the terms (Covid-19) AND (Vaccine) AND (discrete choice experiment). FindingsA total of 39 records were retrieved of which 18 duplicates were identified and removed. Of the remaining 21 records, 10 were excluded because they did not use a DCE approach. 11 studies were included in the meta-analyses with a total of 42 795 participants from three WHO regions. We examined 13 attributes of COVID-19 vaccine that influenced acceptance; cost, vaccine efficacy, number of doses, risk of side effects, proof of vaccination, vaccination setting, duration of immunity, doctors recommendation, proportion of acquaintances vaccinated, region of vaccine manufacture, background knowledge of herd immunity, life attenuated or mRNA, speed of vaccination development. The four attributes reported to influence COVID-19 vaccine preferences most worldwide were; high vaccine efficacy, low risk of side effects, long duration of immunity and low number of doses of the vaccine. ConclusionThe most preferred COVID-19 vaccine attributes should be taken into account by vaccine manufacturers and public health policy makers for better introduction and acceptance of COVID-19 vaccine to the world.