Food Safety Report: Walmart Supercenter, Frontage Road, Picayune, MS, USA 1 year ago • details 18 Suspected food poisoning. Symptoms: Nausea, Vomiting, Stomach Pain, Headache Suspected source: Impossible ground beef Onset: Less than 4 hours Duration: 4 to 12 hours Sick: 2 people Additional information: Happened Yesterday