An outbreak of gastroenteritis following an international conference in Brussels, January 2015

Methods On 10/02/2015 we emailed a standard questionnaire to all attendees to gather demographic, clinical and exposure information and laboratory results. We defined cases as attendees with vomiting, nausea, abdominal pain or diarrhea between 27/01-02/02/2015. We interviewed food handlers and tested leftovers of the sandwiches served. Faecal specimens of five cases were tested for enteric pathogens results were reported in the questionnaire. We computed relative risks with 95% confidence intervals (CIs).