Food Safety Report: Panera Bread, Nall Avenue, Leawood, KS, USA 2 years ago • details 24 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Stomach Pain, Chills Suspected source: Panera Salad Onset: 12 to 24 hours Duration: 4 to 12 hours Sick: 2 people Additional information: ouch