This was an exploratory pilot study forming part of a programme of work to develop and trial an effective web-based intervention to reduce the risk of transmission of respiratory infections by promoting hand-washing and other preventive behaviours in pandemic and non-pandemic contexts. The main purpose of this study was to confirm that the behavioural determinants we had identified from theory were related as predicted to intentions, and to establish the validity of our measures of behavioural intentions.Participants (N = 84) completed a self-report web-delivered questionnaire measuring intentions to engage in hand-washing and the hypothesised behavioural determinants of intentions, based on the Theory of Planned Behaviour and Protection Motivation Theory. In a factorial 2X2 design half the participants were first