TABLE. Rotavirus seasonality and testing results, by years — National Respiratory and Enteric Virus Surveillance System, United States, 2000–2018.
| Years | Season beginning, wk no. | Peak |
Season end, wk no. | Season duration (wks) |
No. of rotavirus tests performed* | Positive rotavirus tests* No. (%) | % Change in rotavirus tests performed*,§ | % Decline in positive rotavirus tests* | |
|---|---|---|---|---|---|---|---|---|---|
| Wk no. | % Positive tests | ||||||||
| 2000–2006† |
50 |
9 |
43.1 |
24 |
26 |
10,845 |
2,778 (25.6) |
Referent |
Referent |
| 2007–2008 |
9 |
17 |
17.3 |
21 |
12 |
11,143 |
1,034 (9.3) |
2.7 |
62.8 |
| 2008–2009 |
4 |
11 |
25.3 |
21 |
17 |
11,078 |
1,231 (11.1) |
2.1 |
55.7 |
| 2009–2010 |
—¶ |
18 |
10.9 |
— |
— |
8,345 |
411 (4.9) |
−23.1 |
85.2 |
| 2010–2011 |
3 |
11 |
23.4 |
21 |
18 |
8,152 |
734 (9.0) |
−24.8 |
73.6 |
| 2011–2012 |
— |
22 |
12.2 |
— |
— |
7,129 |
244 (3.4) |
−34.3 |
91.2 |
| 2012–2013 |
1 |
13 |
27.3 |
18 |
17 |
7,357 |
718 (9.8) |
−32.2 |
74.2 |
| 2013–2014 |
— |
21 |
11.3 |
— |
— |
6,687 |
352 (5.3) |
−38.3 |
87.3 |
| 2014–2015 |
3 |
11 |
25.1 |
16 |
13 |
7,448 |
724 (9.7) |
−31.3 |
73.9 |
| 2015–2016 |
— |
20 |
4.8 |
— |
— |
6,145 |
159 (2.6) |
−43.3 |
94.3 |
| 2016–2017 |
9 |
13 |
21.7 |
19 |
10 |
4,708 |
287 (6.1) |
−56.6 |
89.7 |
| 2017–2018 | — | 17 | 10.3 | — | — | 4,270 | 235 (5.5) | −60.6 | 91.5 |
* Testing data from the 23 laboratories that continuously reported rotavirus test results during 2000–2018.
† Median data are reported for the prevaccine seasons spanning 2000–2006.
§ Compared with number of tests performed during 2000–2006.
¶ Dashes indicate not applicable because seasonal start and end thresholds were not reached.