Population Health Research Brief Series

Abstract

Vaccine hesitancy is one of the most significant threats to global public health efforts. Despite the rapid development and deployment of effective vaccines, resistance to vaccination has persisted in many communities, undermining collective immunity and prolonging health crises, including most recently the COVID-19 pandemic. This brief summarizes findings from a study that used data from over 50 million tweets (later rebranded as X) from 2020 to 2022 to investigate the patterns, justifications, and socioeconomic roots of vaccine hesitancy in the United States. The authors find that Twitter users in states with lower levels of education, higher poverty and unemployment rates, and stronger support for Trump in 2020 were significantly more likely to exhibit vaccine resistance.