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Building on an evolutionary approach to out-group avoidance, this study showed relations between perceived disease salience and beliefs in the efficacy of avoiding foreigners as protective measures in the context of a real-life pandemic risk; i.e., avian influenza. People for whom avian influenza was salient and who held unfavorable attitudes toward foreigners were more likely to believe that avoiding contact with foreigners protects against infection. This finding suggests that individual differences in social attitudes moderate evolved mechanisms relating threat of disease to out-group avoidance.