Food Safety Report: Panda Express, Concord Avenue, Concord, California, USA 1 year ago • details 50 Comments Comment Suspected food poisoning. Symptoms: Nausea, Vomiting, Cramps Suspected source: Few bites from panda express orange chicken walnut shrimp and some other chicken mix Onset: 12 to 24 hours Duration: 4 to 12 hours Sick: Me