In early December, four people experienced burning sensations in the mouth, metallic tastes, facial flushing, nausea, diarrhea, seating, and headache. They all sought physician care for the symptoms, and were diagnosed with scombroid poisoning. The Chester County Health Department (CCHD) investigated. Tuna from the restaurant was tested and found to have five times the normal level of histamines. CCHD and Pennsylvania Department of Agriculture conducted a traceback investigation, and found the fish came from a 40 to 60 pound yellow-fin tuna caught by a commercial fishing boat in the Gulf of Mexico in November, 1998. A wholesale retailer distributed the fish; no violations in handling were found.