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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, 2009-2018*†.

Week Minimum,
2009-16		 Maximum,
2009-16		 2016-2017 2017-2018
1-Aug 1 6 6 5
8-Aug 0 13 3 10
15-Aug 0 7 10 8
22-Aug 0 7 4 6
29-Aug 2 4 4 3
5-Sep 1 7 7 5
12-Sep 2 10 8
19-Sep 2 9 4
26-Sep 4 8 16
3-Oct 2 8 6
10-Oct 2 10 13
17-Oct 2 14 10
24-Oct 1 14 12
31-Oct 7 20 17
7-Nov 2 26 17
14-Nov 6 19 14
21-Nov 6 29 23
28-Nov 10 53 41
5-Dec 9 50 46
12-Dec 17 43 42
19-Dec 10 47 45
26-Dec 13 64 45
2-Jan 19 65 72
9-Jan 21 65 57
16-Jan 27 59 60
23-Jan 37 66 73
30-Jan 33 71 60
6-Feb 31 79 55
13-Feb 32 87 50
20-Feb 36 68 46
27-Feb 27 94 25
6-Mar 28 73 32
13-Mar 14 64 35
20-Mar 16 55 40
27-Mar 19 73 30
3-Apr 14 48 25
10-Apr 5 32 20
17-Apr 8 34 21
24-Apr 6 28 20
1-May 8 25 16
8-May 8 26 8
15-May 4 31 14
22-May 3 15 6
29-May 2 12 10
5-Jun 1 13 7
12-Jun 5 8 5
19-Jun 3 11 12
26-Jun 3 9 4
3-Jul 3 9 8
10-Jul 1 16 7
17-Jul 1 8 11
24-Jul 2 11 12

*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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