This paper investigates the effectiveness of interpersonal information interventions in addressing vaccine hesitancy in developing-country contexts. Using a large-scale randomized controlled trial in rural Indonesia, the study evaluates whether door-to-door outreach by trusted local ambassadors—including community and health-linked messengers—can increase COVID-19 vaccine uptake. The results show no statistically significant impact on vaccination behavior, suggesting that information-based strategies have limited effectiveness once hesitancy is firmly established. The findings offer important insights for the design of public health communication strategies and contribute to the broader literature on behavioral responses to health interventions in low- and middle-income countries.
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https://www.sciencedirect.com/science/article/pii/S0014292124000126