What to know
Past Seasons Estimates
|
Influenza Season† |
Reference |
Study Site(s) |
No. of Patients‡ |
Adjusted Overall VE (%) |
95% CI |
|---|---|---|---|---|---|
|
2004-05* |
WI |
762 |
10 |
-36, 40 |
|
|
2005-06* |
WI |
346 |
21 |
-52, 59 |
|
|
2006-07* |
WI |
871 |
52 |
22, 70 |
|
|
2007-08* |
WI |
1,914 |
37 |
22, 49 |
|
|
2008-09*† |
Unpublished |
WI, MI, NY, TN |
6,713 |
41 |
30, 50 |
|
2009-10* |
WI, MI, NY, TN |
6,757 |
56 |
23, 75 |
|
|
2010-11* |
WI, MI, NY, TN |
4,757 |
60 |
53, 66 |
|
|
WI, MI, PA, TX, WA |
4,771 |
47 |
36, 56 |
||
|
WI, MI, PA, TX, WA |
6,452 |
49 |
43, 55 |
||
|
WI, MI, PA, TX, WA |
5,999 |
52 |
44, 59 |
||
|
WI, MI, PA, TX, WA |
9,311 |
19 |
10, 27 |
||
|
WI, MI, PA, TX, WA |
6,879 |
48 |
41, 55 |
||
| WI, MI, PA, TX, WA | 7,410 |
40 |
32, 46 | ||
| WI, MI, PA, TX, WA | 8,436 |
38 |
31, 43 | ||
| WI, MI, PA, TX, WA | 10,041 |
29 |
21, 35 | ||
| WI, MI, PA, TX, WA | 8,845 |
39 |
32, 44 | ||
| n/a | n/a | n/a |
n/a |
||
| CA, MI, PA, TN, TX, WA, WI | 4,312 |
36 |
21, 48 | ||
| MI, PA, TX, WA, AZ, MO, OH | 2,561 | 30 | -9, 54 | ||
| ACIP Presentation on February 28, 2024 [PDF - 2 MB] | AZ, MI, MO, PA, OH, TX, WA | 3,394 | 42 | 29, 53 |
*From 2004-2005 through 2010-2011, the Flu VE Network also enrolled inpatients.
**2020-2021 flu vaccine effectiveness was not estimated due to low influenza virus circulation during the 2020-2021 flu season.
†Vaccine effectiveness (VE) estimates for the 2008-2009 flu season have not been published.
‡Number of patients used in VE calculation.
††VE estimates for 2022-2023 flu season are preliminary.
***Overall VE was calculated for this table to be consistent with what has been reported historically and is available for comparison with historical estimates. All other 2023-2024 VE estimates are reported by age group.
Information on how these estimates are calculated can be found on Situs Slot Gacor's web page How Flu Vaccine Effectiveness and Efficacy are Measured.