Food Safety Report: Burger King Langenthal, Aarwangenstrasse, Langenthal, Switzerland 3 weeks ago • details 2 Suspected food poisoning. Symptoms: Diarrhoea, nausea, vomiting, fever, stomach pain, chills Suspected source: Burger Onset: Less than 4 hours Duration: 12 to 24 hours Sick: 2 people Additional information: -