Food Safety Report: Sweet Potatoes Fries, Costco Wholesale, Jefferson Avenue, Newport News, VA, USA 1 year ago • details 43 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Vomiting, Stomach Pain, Chills, Headache Suspected source: Sweet potato fries Onset: 4 to 12 hours Duration: 4 to 12 hours Additional information: Sweet potato fries gave my wife and I food poisoning