ABSTRACT Applying the health belief model, this study examined young adults' intention to adopt preventive behaviors against influenza infection in developing countries (Thailand and Cambodia) and developed countries (the USA and Singapore). Self-efficacy was the only variable significantly related to behavioral intention in the developing countries. In contrast, perceived threat, expected benefits, and media attention were significant predictors in the developed countries. Trust in information sources also had a consistent impact across the variable significantly related to behavioral intention in the developing countries. Theoretical and practical implications of the findings are discussed
