Food Safety Report: Walmart Supercenter, South Main Street, Manteca, CA, USA 2 years ago • details 8 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Vomiting, Chills Suspected source: Vanilla Wafers Onset: 12 to 24 hours Duration: 4 to 12 hours Additional information: Great Value Vanilla Wafers