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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, 2009-2017*†.

Week Minimum,
2009-15
Max,
2009-15
2015-2016 2016-2017
1-Aug 1 6 6 6
8-Aug 0 10 13 3
15-Aug 0 7 5 10
22-Aug 0 7 3 4
29-Aug 2 4 3 4
5-Sep 1 7 6 7
12-Sep 2 10 3 8
19-Sep 2 7 9 4
26-Sep 4 8 5 15
3-Oct 2 7 8 6
10-Oct 2 10 8 13
17-Oct 2 13 14 11
24-Oct 1 14 9 11
31-Oct 7 20 17 19
7-Nov 2 26 15 17
14-Nov 6 19 13 14
21-Nov 6 29 10 23
28-Nov 10 53 22 41
5-Dec 9 50 28 46
12-Dec 17 43 30 42
19-Dec 10 47 19 44
26-Dec 19 64 13 44
2-Jan 19 65 47 70
9-Jan 21 65 55 56
16-Jan 27 59 42 61
23-Jan 37 66 49 72
30-Jan 33 71 45 64
6-Feb 31 79 54 55
13-Feb 32 87 52 50
20-Feb 36 68 49 48
27-Feb 27 94 46 25
6-Mar 28 73 49 31
13-Mar 14 64 41 35
20-Mar 16 55 44 39
27-Mar 19 73 44 30
3-Apr 14 48 35 26
10-Apr 5 31 32 18
17-Apr 8 34 33 19
24-Apr 6 28 18 23
1-May 8 25 23 15
8-May 8 24 26  9
15-May 4 21 31  14
22-May 3 10 15  6
29-May 2 12 6  6
5-Jun 1 13 6  4
12-Jun 5 7 8
19-Jun 3 11 5
26-Jun 3 9 5
3-Jul 3 9 9
10-Jul 1 16 4
17-Jul 1 8 7
24-Jul 2 8 11

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

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

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

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