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Cases of acute gastroenteritis, by date of symptom onset, in persons who attended either a medical continuing professional development event (event 1) or a trade fair event (event 2) and consumed food and/or beverage items provided by a single catering company between 20 and 22 September 2010. A case was defined as a person with an illness consisting of either vomiting or diarrhoea and one other gastroenteritis symptom.
