Past Seasons Estimated Influenza Disease Burden Averted by Vaccination
This web page provides estimates on the burden of seasonal influenza and of the impact of annual influenza vaccination in the United States for the 2014–2015 through the 2021-2022 influenza seasons.
| | Averted Symptomatic Illnesses | Averted Medical Visits | Averted Hospitalizations | Averted Deaths | ||||
|---|---|---|---|---|---|---|---|---|
| Season | Estimate | 95% UI | Estimate | 95% UI | Estimate | 95% UI | Estimate | 95% UI |
| 2010-2011 | 5,600,000 | (3,100,000, 14,000,000) | 2,800,000 | (1,700,000, 6,900,000) | 80,000 | (19,000, 380,000) | 9,800 | (1,300, 58,000) |
| 2011-2012 | 2,200,000 | (830,000, 12,000,000) | 1,100,000 | (410,000, 5,400,000) | 44,000 | (4,900, 320,000) | 4,200 | (320, 41,000) |
| 2012-2013 | 5,500,000 | (3,700,000, 11,000,000) | 2,700,000 | (1,900,000, 5,300,000) | 60,000 | (23,000, 290,000) | 3,700 | (850, 25,000) |
| 2013-2014 | 7,500,000 | (4,300,000, 12,000,000) | 3,500,000 | (2,000,000, 5,500,000) | 100,000 | (35,000, 250,000) | 12,000 | (2,300, 41,000) |
| 2014-2015 | 1,400,000 | (8,300, 4,200,000) | 700,000 | (4,200, 2,100,000) | 39,000 | (160, 190,000) | 3,700 | (13, 20,000) |
| 2015-2016 | 5,300,000 | (2,500,000, 9,200,000) | 2,700,000 | (1,300,000, 4,500,000) | 70,000 | (15,000, 170,000) | 5,900 | (510, 20,000) |
| 2016-2017 | 5,300,000 | (2,400,000, 11,000,000) | 2,700,000 | (1,300,000, 5,400,000) | 72,000 | (13,000, 190,000) | 5,200 | (360, 16,000) |
| 2017-2018 | 5,900,000 | (4,700,000, 7,400,000) | 3,100,000 | (2,400,000, 3,900,000) | 82,000 | (40,000, 100,000) | 4,800 | (1,000, 14,000) |
| 2018-2019 | 3,100,000 | (2,400,000, 4,700,000) | 1,600,000 | (1,200,000, 2,400,000)) | 43,000 | (30,000, 160,000) | 2,800 | (700, 16,000)) |
| 2019-2020 | 7,000,000 | (5,400,000, 8,900,000) | 3,400,000 | (2,600,000, 4,300,000) | 100,000 | (52,000, 153,000) | 7,100 | (2,000, 27,000) |
| 2021-2022 | 1,800,000 | (1,000,000, 2,800,000) | 1,000,000 | (500,000, 1,400,000) | 22,000 | (6,000, 60,000) | 1,000 | (0, 7,000) |
*Estimates are not available for the 2020-2021 flu season due to minimal influenza activity.
