The Covid-19 Information Void: How Pro-Vaccination Voices Lost the Narrative in South Africa

Abstract

The erosion of public trust in health information and government communication, particularly during criseslike the Covid‐19 pandemic, highlights a critical challenge in how health policies are transmitted andreceived. This study examines the dramatic shift in public sentiment toward Covid‐19 vaccination in SouthAfrica during 2021, a period that saw a decline from initial high acceptance to significant hesitancy.We argue that a process of social media selection allowed extreme views to proliferate as official sourcesretreated. Our findings suggest that sustained or increased mainstream media engagement, particularly fromofficial sources like government and health authorities, could have mitigated the dominance of anti‐vaccinenarratives and have crucial implications for government communication and public health policies in thedigital age. We collected and classified 482,450 original tweets about vaccination. We show that, by the endof 2021, Twitter activity was characterized by a progressive surge in anti‐vaccination tweets and a decline inpro‐vaccination and factual information, particularly from mainstream media. This shift mirrors the decreasein actual vaccination rates. Employing agent‐based modeling, we simulated counterfactual scenarios toassess the impact of media presence on vaccine discourse. The results indicate that sustained or increasedmedia engagement could have mitigated the dominance of anti‐vaccine narratives. Conversely, a simulatedmedia downturn led to a steeper decline in pro‐vaccination content. The findings suggest that mainstreamnews media play a crucial role in shaping public perceptions of and support for health policies and that theirdisengagement creates an informational void exploited by misinformation.