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Large gastroenteritis outbreak due to norovirus GII in São Paulo, Brazil, summer 2010.

In summer 2010 (January-March 2010), the state of São Paulo (SP), located in Southern of Brazil, experienced a large gastroenteritis outbreak due to Norovirus (NoV), a common viral pathogen associated with diarrhea, with marked seasonality during spring and summer. The coast line area of the state was the most affected, probably due to the increase of population density during the summer vacations, flooding in conjunction with the waterborne and seafood components of the NoV transmission.