Food Safety Report: Olive Garden Italian Restaurant, 5815 Suemandy Drive, St. Peters, MO, USA 1 year ago • details 54 Suspected food poisoning. Symptoms: Diarrhea, Stomach Pain, Cramps Suspected source: Food poisoning or stomach flu Onset: 12 to 24 hours Duration: 12 to 24 hours Sick: Me Additional information: Unsure if cause was food or virus