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Surveillance of Norovirus Outbreaks, Figure 1

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From January 2009 through December 2010, acute gastroenteritis (AGE) outbreaks exhibited winter seasonality: 68% (2,972 of 4,376) of AGE outbreaks occurred during November–April. 80% (1,530 of 1,908) of outbreaks caused by norovirus and 71% (1,086 of 1,524) caused by unknown etiologies occurred during November–April.

Number of reported acute gastroenteritis outbreaks by month of first illness onset and etiology, National Outbreak Reporting System, United States, 2009-2010.

*Includes outbreaks caused by a single etiologic agent other than norovirus or multiple etiologies.

Image courtesy of Hall AJ, Wikswo ME, Manikonda K, Roberts VA, Yoder JS, Gould LH. Acute Gastroenteritis Surveillance through the National Outbreak Reporting System, United States. EID Journal. Aug 2013; 19(3).

  • Page last reviewed: September 26, 2013
  • Page last updated: September 26, 2013
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    • Office of the Associate Director for Communication
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