Twenty percent of an Alaskan company's workforce became ill with gastroenteritis after eating food served at a company luncheon was implicated. The case control study associated eating potato salad with risk of illness. The potato salad had been prepared two days prior to serving by a restaurant foodhandler who had been ill and who had mixed the potato salad with bare hands. Norovirus was isolated from the stool of luncheon attendees, two restaurant patrons, and the ill food handler who had made the potato salad.