We will follow people in the behavioral subsample at 1 week to find out their actual behaviors. We will follow all subjects at 2 months to find out self-reported disease status. We ask persons reporting a visit to an M.D. for illness to mail a form to their physician for confirmation of diagnosis and to provide information about health-care use. The main outcome is Lyme disease. Intermediate outcomes include change in self-efficacy, behavioral intention, and health behaviors.