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Norovirus Regional Trends						Print
													Updated February 15, 2024
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Participating U.S. laboratories report the total number of norovirus tests performed that week, and the number of those tests that were positive to CDC weekly. Because reporting delays may be expected for some laboratories, data shown for the more recent weeks may be less complete than others. Each point on the trend graphs below displays the average percent of tests that were positive from three adjacent weeks: the specified week, and the weeks preceding and following it. This is also known as a centered 3-week moving average.
In the United States, outbreaks of norovirus occur most frequently during late fall, winter, and early spring. There may be variation in the timing of outbreaks between regions and between communities in the same region.
Census Region Image Map, Census Region SelectorAbout Census Regions and Divisions [1 MB, 2 pages]Southern United States Census Region
SVG: Southern United States percent positive Rotavirus tests, by week
Table: Southern United States percent positive norovirus tests, by weekNortheastern United States Census Region
SVG: Northeastern United States percent positive Rotavirus tests, by week
Table: Northeastern United States percent positive norovirus tests, by weekMidwestern United States Census Region
SVG: Midwestern United States percent positive Rotavirus tests, by week
Table: Midwestern United States percent positive norovirus tests, by weekWestern United States Census Region
SVG: Western United States percent positive Rotavirus tests, by week
Table: Western United States percent positive norovirus tests, by week
							
					
							Last Reviewed:  February 15, 2024						Source: 	National Center for Immunization and Respiratory Diseases (NCIRD), Coronavirus and Other Respiratory Viruses Division
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