Food Safety Report: Walmart Supercenter, Levittown Center, Levittown, PA, USA 1 year ago • details 20 Comments Comment 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