Food Safety Report: Tesco Superstore, London Road West, Amersham, UK 2 years ago • details 3 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Vomiting, Stomach Pain, Cramps Suspected source: Salmon Onset: 12 to 24 hours Duration: 12 to 24 hours Sick: More than 6 Additional information: The salmon didn’t taste fresh as normally expected after cooking.