A large outbreak of hepatitis A resulted from an infected food worker who prepared many uncooked foods served at 41 catered events. In October, 1994, when the food worker's illness was reported to the Kentucky State Health Department, patrons were not offered immune globulin because the food worker's hygiene was assessed to be good and because the food worker denied having diarrhea. Beginning in November, reports of hepatitis A among patrons of the catered events surfaced. Illness was linked to 21 of the catered events. Attending an event where there was no on-site sink or on-site kitchen increased illness risk. Eating uncooked foods was associated with illness risk.