Foodborne Illness — Worldwide/Unknown
Epidemiology:
The study population was the staff and students at the school. The study design was a retrospective cohort study, including all students and staff (cleaning, teaching and kitchen staff) attending the school on Wed 20 and/or Thu 21 Mar 2013. We defined a case as any student or member of staff with onset of gastrointestinal symptoms (any one of the following: diarrhea, abdominal pain, nausea, vomiting) between 20 and 23 Mar 2013.
We developed an online structured questionnaire
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