Salmonella Thompson associated with improper handling of roast beef at a restaurant in Sioux Falls, South Dakota

In October 1996, we investigated an outbreak of Salmonella serotype Thompso n infections associated with Restaurant A in Sioux Falls, South Dakota, and conducted two cohort studies among persons who ate at luncheons catered by Restaurant A. Fifty-two Salmonella Thompson infections were identified bet ween 29 September and 14 October 1996. Infections occurred among employees and patrons at Restaurant A and among attendees at three luncheons catered by the restaurant on 7 October. Roast beef cooked at Restaurant A was the o nly food item significantly associated with illness. Cooking times and stor age temperatures for roast beef were inadequate to prevent multiplication o f Salmonella, and the chefs were unaware of proper cooking and storage temp eratures. We conclude that improper handling of roast beef probably caused this outbreak of Salmonella Thompson infections. Better knowledge of food s afety practices by the cooking staff at Restaurant A, through required food safety education, might have prevented the outbreak.