Food Safety Report: Costco Wholesale, West Ox Road, Fairfax, VA, USA 1 year ago • details 56 Comments Comment Suspected food poisoning. Symptoms: Diarrhea Suspected source: Asian Dumplings from Costco. Al Vapor Onset: 4 to 12 hours Duration: 12 to 24 hours Additional information: Al vapor Dumplings. Horrible diarrhea… See more