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NoroSTAT Data Table

Suspected and Confirmed Norovirus Outbreaks Reported by State Health Departments in Massachusetts, Michigan, Minnesota, Ohio, Oregon, South Carolina, Tennessee, Virginia, and Wisconsin to the National Outbreak Reporting System (NORS) by Week of Illness Onset, 2009-2016*†.

Week Minimum,
2009-12
Range,
2009-12
2012-13 2013-14 2014-15 2015-2016 2016-2017
1-Aug 3 1 6 5 1 6 5
8-Aug 0 5 10 3 6 13 4
15-Aug 0 7 5 3 5 5 11
22-Aug 0 4 7 4 7 3 6
29-Aug 3 1 3 2 4 3 4
5-Sep 1 4 2 7 6 5 7
12-Sep 2 4 8 4 4 3 10
19-Sep 1 5 6 4 4 9 9
26-Sep 3 5 7 3 4 5 16
3-Oct 2 4 4 5 2 8 7
10-Oct 1 8 6 4 10 7 12
17-Oct 1 11 10 5 5 14 11
24-Oct 1 11 14 9 5 7 7
31-Oct 7 10 18 9 15 16 15
7-Nov 2 17 24 4 15 12 2
14-Nov 6 6 16 11 18 11  
21-Nov 5 16 28 13 12 9  
28-Nov 10 28 53 28 31 22  
5-Dec 9 36 39 36 30 26  
12-Dec 17 23 33 35 33 23  
19-Dec 9 33 36 24 28 13  
26-Dec 18 39 41 34 29 10  
2-Jan 19 37 37 42 32 43  
9-Jan 17 40 43 30 34 47  
16-Jan 22 23 40 34 43 38  
23-Jan 32 22 48 30 41 37  
30-Jan 27 33 51 37 58 33  
6-Feb 24 35 31 37 57 47  
13-Feb 22 49 55 51 56 41  
20-Feb 24 15 48 45 63 42  
27-Feb 21 25 61 51 86 36  
6-Mar 22 3 55 64 53 33  
13-Mar 12 10 32 53 40 24  
20-Mar 8 11 39 51 45 32  
27-Mar 14 3 40 61 35 37  
3-Apr 10 4 37 43 28 27  
10-Apr 4 11 23 25 20 24  
17-Apr 7 9 20 23 18 23  
24-Apr 4 10 13 25 20 13  
1-May 12 1 8 16 20 20  
8-May 6 11 16 23 18 22  
15-May 4 6 9 20 10 30  
22-May 3 4 9 6 9 11  
29-May 2 4 5 9 10 6  
5-Jun 1 4 4 12 8 5  
12-Jun 5 0 5 7 6 7  
19-Jun 3 1 5 9 3 5  
26-Jun 3 6 5 6 5 5  
3-Jul 3 6 4 5 3 9  
10-Jul 1 5 11 14 5 4  
17-Jul 1 7 7 8 7 7  
24-Jul 2 4 8 4 6 11  

*Incomplete outbreak data from 2009-12 was supplemented with information from state health department records.

†Michigan and South Carolina joined the NoroSTAT network at the start of the 2015-16 reporting season; 2009-15 data from these states has been added for comparison.

‡Massachusetts and Virginia joined the NoroSTAT network at the start of the 2016-17 reporting season; 2009-16 data from these states has been added for comparison.

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