People who competed and observed a robotics competition in Richmond, Virginia, reported gastrointestinal disease in March. Health department workers began by interviewing robotics team leaders, volunteers, judges and staff. Cohort studies of selected teams showed a significant statistical correlation between attending the hosting school's reception meal and illness. Further analysis of food histories pointed to the turkey and ham sandwiches as the contaminated foods. No violations were found in the catering operation nor were any food handlers ill. Stool samples collected from case-patients tested positive for Norovirus. The pattern of illness pointed to a point source followed by person-to-person spread which would be consistent with a single meal exposure followed by close contact between participants.