How has COVID-19 impacted the public discourse around vaccines? A comparative analysis of Twitter

Abstract

This study examines the public discourse about vaccines on Twitter during the COVID-19 pandemic and compares it with the discourses about vaccines before the pandemic. Discourse, users’ profile, content, tone, vaccines, and sources of information were manually coded. We have identified a diversity of discourses related to vaccines. The discourse that has stood out the most during the pandemic is related to pandemic management measures. Nevertheless, both denialist and anti-denialist discourses are reduced compared to the previous period. Besides this, less polarization and more neutral discourse were identified during the pandemic. The two periods are expressly marked by tweets with content related to opinions and personal experiences regarding vaccines. Some of them are characterized, in general, by informality in how the users communicate their ideas. Interestingly, users from the medical-scientific sphere did not participate more in Twitter during the pandemic. There were fewer posts including scientific findings and more tweets about patient resources. On the other hand, the media and journalists were very active in this period by disseminating information and issuing vaccine opinions, reflecting their essential role in health crises. However, the presence of television channels, such as Fox News, can be an indication of conservative ideas on vaccines. Thus, the discourses have expressed different meanings in relation to the issue and disputed their legitimacy in this symbolic and virtual market.