Norovirus outbreak reports from State Health Departments by week of year. For more details see https://www.cdc.gov/norovirus/php/reporting/norostat-data-table.html.

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Figure 1: Weekly outbreak counts for the current year (as of 4/14/2025).
Figure 2: Scatterplot of weekly case numbers for the years 2020-21 (horizontal) and 2024-25 (vertical).
Figure 3: A scatterplot of CDC norovirus data. Vertical axis shows the maximum number of outbreaks reported within a given calendar week across all years (horizontal axis shows the minimum number). For example, the point (1, 9) represents the reporting of a minimum of only one outbreak reported in the week beginning August 1st, and a maximum of nine outbreaks reported during that same calendar week for some (unknown) year between 2012 and 2020.

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    Week Min_2012_20 Max_2012_20 Yrs_2020_21 Min_2021_24 Max_2021_24
1  1-Aug           1           9           0           5           8
2  8-Aug           2          17           1           2           7
3 15-Aug           4          13           1           6           7
4 22-Aug           5          10           2           3           7
5 29-Aug           0          13           1           4           6
6  5-Sep           4          13           0           3          14
  Yrs_2024_25
1           8
2           8
3           6
4           9
5          12
6          14

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     Week            Min_2012_20     Max_2012_20     Yrs_2020_21   
 Length:52          Min.   : 0.00   Min.   : 8.00   Min.   : 0.00  
 Class :character   1st Qu.: 1.75   1st Qu.:13.00   1st Qu.: 1.00  
 Mode  :character   Median : 5.00   Median :27.50   Median : 5.50  
                    Mean   :12.42   Mean   :37.04   Mean   :10.02  
                    3rd Qu.:24.50   3rd Qu.:62.00   3rd Qu.:15.00  
                    Max.   :45.00   Max.   :93.00   Max.   :52.00  
                                                                   
  Min_2021_24     Max_2021_24      Yrs_2024_25    
 Min.   : 1.00   Min.   :  4.00   Min.   :  6.00  
 1st Qu.: 5.00   1st Qu.: 12.75   1st Qu.: 14.00  
 Median :10.00   Median : 22.50   Median : 41.00  
 Mean   :18.94   Mean   : 32.69   Mean   : 68.06  
 3rd Qu.:32.00   3rd Qu.: 53.75   3rd Qu.:111.50  
 Max.   :76.00   Max.   :107.00   Max.   :201.00  
                                  NA's   :21