Achieving broad immunity through vaccination is a cornerstone strategy for long-term management of COVID-19 infections, particularly the prevention of serious cases and hospitalizations. Evidence that vaccine-induced immunity wanes over time points to the need for COVID-19 booster vaccines, and maximum compliance is required to maintain population-level immunity. Little is known of the correlates of intentions to receive booster vaccines among previously vaccinated individuals. The present study applied an integrated model to examine effects of beliefs from multiple social cognition theories alongside sets of generalized, stable beliefs on individuals' booster vaccine intentions. US residents (N = 479) recruited from an online survey panel completed measures of social cognition constructs (attitude, subjective norms, perceived behavioral control, and risk perceptions), generalized beliefs (vaccine hesitancy, political orientation, and free will beliefs), and COVID-19 vaccine intentions. Social cognition constructs were related to booster vaccine intentions, with attitude and subjective norms exhibiting the largest effects. Effects of vaccine hesitancy, political orientation, and free will beliefs on intentions were mediated by the social cognition constructs, and only vaccine hesitancy had a small residual effect on intentions. Findings provide preliminary evidence that contributes to an evidence base of potential targets for intervention messages aimed at promoting booster vaccine intentions.

中文翻译：

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预测 COVID-19 加强疫苗的意图

通过疫苗接种实现广泛免疫是长期管理 COVID-19 感染的基石战略，尤其是预防严重病例和住院治疗。疫苗诱导的免疫力随着时间的推移而减弱的证据表明需要 COVID-19 加强疫苗，并且需要最大程度的依从性来维持人群水平的免疫力。以前接种过疫苗的个体中接受加强疫苗的意图的相关性知之甚少。本研究应用了一个综合模型来检验来自多种社会认知理论的信念以及对个人加强疫苗意图的广泛、稳定的信念的影响。美国居民（N = 479）从在线调查小组招募完成了社会认知结构（态度、主观规范、感知行为控制和风险感知）、普遍信念（疫苗犹豫、政治取向和自由意志信念）和 COVID-19 疫苗的测量意图。社会认知结构与加强疫苗的意图有关，态度和主观规范表现出最大的影响。疫苗犹豫、政治取向和自由意志信念对意图的影响是由社会认知结构介导的，只有疫苗犹豫对意图的残余影响很小。研究结果提供了初步证据，有助于为旨在促进加强疫苗意图的干预信息的潜在目标提供证据基础。