CDC Seasonal Flu Vaccine Effectiveness Studies | CDC

Influenza Season†

Reference

Study Site(s)

No. of Patients‡

Adjusted Overall VE (%)

95% CI

2004-05*

Belongia 2009

WI

762

10

-36, 40

2005-06*

Belongia 2009

WI

346

21

-52, 59

2006-07*

Belongia 2009

WI

871

52

22, 70

2007-08*

Belongia 2011

WI

1,914

37

22, 49

2008-09*†

Unpublished

WI, MI, NY, TN

6,713

41

30, 50

2009-10*

Griffin 2011

WI, MI, NY, TN

6,757

56

23, 75

2010-11*

Treanor 2011

WI, MI, NY, TN

4,757

60

53, 66

2011-12

Ohmit 2014

WI, MI, PA, TX, WA

4,771

47

36, 56

2012-13

McLean 2014

WI, MI, PA, TX, WA

6,452

49

43, 55

2013-14

Gaglani 2016

WI, MI, PA, TX, WA

5,999

52

44, 59

2014-15

Zimmerman 2016

WI, MI, PA, TX, WA

9,311

19

10, 27

2015-16

Jackson 2017

WI, MI, PA, TX, WA

6,879

48

41, 55

2016-17

Flannery 2018

WI, MI, PA, TX, WA
7,410

40

32, 46

2017-18

Rolfes 2019

WI, MI, PA, TX, WA
8,436

38

31, 43

2018-19

Flannery 2019

WI, MI, PA, TX, WA
10,041

29

21, 35

2019-20

Tenforde 2021

WI, MI, PA, TX, WA
8,845

39

32, 44

2021-22

Price 2022

CA, MI, PA, TN, TX, WA, WI
4,312

36

21, 48