Local and state health officials investigated an outbreak of Staphylococcus aureus among attendees of a benefit event called "Ribs, Rides, N Rock" held at the World's Fair Park in Knoxville, Tennessee. At least 50 people were ill. Staphylococcus aureus was detected in laboratory tests of pork samples and case-patient specimens. Epidemiologic and environmental evidence supports the hypothesis that inadequate storage of cooked, pulled pork facilitated toxin development sufficient to cause illness after consumption. Pork butts were prepared by Pop's Texas Barbeque. Investigators determined that storage temperature at Pop's was not adequate for storage, preparation, display, service or transportation.