Food Safety Report: HarbourFront Walk, WOK HEY VivoCity, Harbourfront, Singapore 1 year ago • details 18 I ordered egg fried rice with prawn but after 4 hours of consuming it I got cough and sore throat. Suspected food poisoning. Symptoms: other: Sore throat and cough Suspected source: Egg fried rice with prawn Onset: 4 to 12 hours