Past Seasons Estimated Influenza Disease Burden Prevented 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 2010-2011 through the 2022-2023 influenza seasons.
| Prevented Symptomatic Illnesses | Prevented Medical Visits | Prevented Hospitalizations | Prevented 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) | 7,200 | (2,000, 27,000) |
| 2021-2022** | 1,800,000 | (1,000,000, 2,700,000) | 900,000 | (500,000, 1,400,000) | 22,000 | (6,000, 62,000) | 1,100 | (0, 7,000) |
| 2022-2023** | 5,900,000 | (4,000,000, 7,700,000) | 2,900,000 | (1,900,000, 3,800,000) | 64,000 | (34,000, 96,000) | 3,600 | (0, 12,000) |
*Estimates are not available for the 2020-2021 flu season due to minimal influenza activity.
** Estimates are preliminary and will be updated when additional information for that season is available.
