Food Safety Report: Walmart Supercenter, Levittown Center, Levittown, PA, USA 7 months ago • details 20 Suspected food poisoning. Symptoms: Diarrhea, Nausea, Vomiting, Stomach Pain, Cramps Suspected source: Salad, romaine lettuce cabbage carrot mix Onset: Right away Duration: 4 to 12 hours Sick: Me