TABLE 1. Reporting indicators of norovirus outbreaks reported to the National Outbreak Reporting System (NORS) and CaliciNet — Norovirus Sentinel Testing and Tracking, United States,* August 2009–July 2015.
| Reporting indicators | NoroSTAT states (n = 5) |
Other states (n = 47) |
||||
|---|---|---|---|---|---|---|
| Pre-NoroSTAT |
Post-NoroSTAT |
p-value | Pre-NoroSTAT |
Post-NoroSTAT |
p-value | |
| Aug 2009–Jul 2012 | Aug 2012–Jul 2015 | Aug 2009–Jul 2012 | Aug 2012–Jul 2015 | |||
|
Total NORS reports
|
1,357
|
1,981
|
—
|
2,843
|
3,738
|
—
|
| Median NORS reports per 1,000,000 p-y* (range) |
17.3 (4.1–32.8) |
21.0 (6.1–41.5) |
0.16 |
3.0 (0.1–55.1) |
4.1 (0.1–72.2) |
0.045 |
| Median reporting lag (days) |
22 |
2 |
<0.001 |
26 |
26 |
0.29 |
| No. (%) reported within 7 business days |
359 (26) |
1,888 (95) |
<0.001 |
328 (12) |
500 (13) |
0.026 |
| No. (%) with all required fields completed |
1,183 (87) |
1,979 (99.9) |
<0.001 |
1,235 (43) |
2,396 (64) |
<0.001 |
|
Total CaliciNet reports
|
657
|
1,077
|
—
|
1,885
|
2,174
|
—
|
| Median CaliciNet reports per 1,000,000 p-y (range) |
4.9 (1.9–22.0) |
9.0 (2.6–26.2) |
0.036 |
2.6 (0.05–34.6) |
2.1 (0.08–24.7) |
0.63 |
| Median reporting lag (days) |
21 |
3 |
<0.001 |
21 |
11 |
<0.001 |
| No. (%) reported within 7 business days |
188 (29) |
1,018 (95) |
<0.001 |
196 (10) |
651 (30) |
<0.001 |
| No. (%) linkable to NORS reports with reporter-supplied ID | 564 (86) | 1,027 (95) | <0.001 | 552 (29) | 718 (33) | 0.016 |
Abbreviations: NoroSTAT = Norovirus Sentinel Testing and Tracking; p-y = person-years.
*NoroSTAT-participating states during 2009–2015 were Minnesota, Ohio, Oregon, Tennessee, and Wisconsin. Washington, DC and Puerto Rico are included with other states.