Food Safety Report: In-N-Out Burger, Foothill Boulevard, Upland, CA, USA 2 years ago • details 7 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Fever, Stomach Pain, Chills, Headache Suspected source: hamburger, either the patty or the lettuce Onset: 1 to 2 days Duration: Several days Additional information:… See more