Conspiracy Theories about Infectious Diseases: An Introduction

Understanding why people believe conspiracy theories related to disease outbreaks and the consequences of such beliefs is critical for combating both the COVID-19 pandemic and its corresponding "infodemic.” In the introduction to this special issue on conspiracy theories about infectious diseases, the authors first provide a brief overview of the narratives of conspiracy theories related to COVID-19, followed by a review of extant theoretical frameworks regarding the psychology of conspiracy beliefs. Specifically, they discuss how epistemic, existential, and social needs contribute to the holding of conspiracy beliefs. Then, the authors summarize the major findings from the nine empirical articles featured in this issue, particularly how they shed light on the antecedents and consequences of disease-related conspiracy beliefs. They conclude by discussing future directions for the study of disease-related conspiracy beliefs.

COVID-19-related conspiracy theories in China

Many COVID-19 conspiracy theories implicate China and its agents, whether implicitly or explicitly, as conspirators with potentially malicious intent behind the current pandemic. We set out to explore whether Chinese people believe in pandemic-related conspiracy theories, and if so, how do their secure (in-group identification) and defensive (collective narcissism) in-group positivity predict their conspiracy beliefs. We hypothesized that national identification would negatively predict the tendency to attribute responsibility to an in-group, thus predicting less risk-rejection conspiracy theory beliefs (e.g., COVID-19 is a hoax). In contrast, national collective narcissism would positively predict the tendency to attribute responsibility for the pandemic to an out-group, which in turn would validate conspiracy theories that acknowledge the risk of the pandemic (e.g., COVID-19 is a bioweapon). To test these predictions, we collected data in China (n = 1,200) in April 2020. Supporting our predictions, national identification was negatively associated with risk-rejection conspiracy beliefs via in-group attribution, whereas national collective narcissism was positively associated with risk-acceptance conspiracy beliefs via out-group attribution.

Not-so-straightforward links between believing in COVID-19-related conspiracy theories and engaging in disease-preventive behaviours

Since the start of the COVID-19 pandemic, pertinent conspiracy theories have proliferated online, raising the question: How might believing in those conspiracy theories be linked with engagement in disease-preventive behaviours? To answer this, we conducted a repeated cross-sectional survey of around 1500 respondents to examine the link between conspiracy-theory beliefs and disease-preventive behaviours across six time-points in the United States from early February to late March 2020. The findings reveal that believing in risk-acceptance conspiracy theories (RA-CTs;e.g., “COVID-19 is a man-made bioweapon”) was linked to more preventive behaviours. However, believing in risk-rejection conspiracy theories (RR-CTs;e.g., “COVID-19 is like influenza and was purposefully exaggerated”) was associated with fewer preventive behaviours. These differential links were mediated by risk perception and negative emotions and modulated by the stage of the outbreak—RA-CTs predicted higher risk perception in the mild stage, whereas RR-CTs predicted lower risk perception in the severe stage.