Positive emotions co-experienced with strangers and acquaintances predict COVID-19 vaccination intentions through prosocial tendencies

Background: The efficacy of vaccination depends on its widespread adoption, making vaccine uptake not just a personal health behavior but also a prosocial one. Previous research has shown that everyday moments of coexperienced positive emotions (positivity resonance) are associated with higher prosocial tendencies, and these moments, in turn, prospectively predict people's pandemic hygiene behaviors. Yet, limited research has explored how moments of positivity resonance may have predicted greater COVID-19 vaccine intentions during the early months of the pandemic. Methods: We longitudinally surveyed a national U.S. sample across four weeks during the fall of 2020. We tested the hypothesis that positivity resonance with strangers and acquaintances indirectly predicts COVID-19 vaccine intentions, as statistically mediated by prosocial tendencies. We also aimed to replicate the indirect effects of positivity resonance on hygiene behaviors (such as mask wearing and hand washing), effects that have been demonstrated in previous research. Results: In a pre-registered structural equation model, we found that perceived positivity resonance experienced with strangers and acquaintances prospectively predicted prosocial tendencies, which in turn amplified people's COVID-19 vaccine intentions (8 = 0.053) and hygiene behaviors - i.e., social distancing (8 = 0.032), mask wearing (8 = 0.027), hand washing (8 = 0.049). Conclusions: Understanding the effects of high-quality social interactions with strangers and acquaintances on vaccine intentions and hygiene behaviors is critical, particularly given the likelihood of emerging pandemics and novel vaccines. We discuss theoretical and practical implications related to perceived positivity resonance, prosocial tendencies, and vaccination uptake for novel vaccines.