Food Safety Report: Tesco Leyland Extra, Towngate, Leyland, UK 2 years ago • details 5 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Fever, Stomach Pain, Cramps, Chills, Headache Suspected source: prawns Onset: 4 to 12 hours Duration: 4 to 12 hours Additional information: Ready cooked prawns was in date