Emerging research reveals that news of disease outbreaks impacts human cognition in unexpected ways, activating what scientists call the “behavioural immune system.” This system, an evolved psychological response to pathogens, isn't about physical immunity but rather influences behaviour to avoid contamination. This activation leads to harsher moral judgements, as individuals become more critical of perceived transgressions. Studies suggest this heightened sense of aversion can extend beyond physical health concerns, contributing to prejudiced attitudes. Specifically, the “behavioural immune system” may play a role in fostering xenophobia – a fear or dislike of those perceived as foreign or different. The findings highlight the complex interplay between public health, psychology, and societal biases, indicating disease-related anxieties can have significant social consequences. Understanding these mechanisms is crucial for mitigating negative social impacts during outbreaks.