Food Safety Report: Taco Bell, Shenzhen, Guangdong Province, China 2 years ago • details 3 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Vomiting, Fever, Stomach Pain, Cramps, Chills, Headache Suspected source: Taco Bell Onset: 4 to 12 hours Duration: 12 to 24 hours