Past Seasons Estimated Influenza Disease Burden
These pages includes information about the estimated burden of influenza from past seasons, including tables of the estimated influenza disease burden (and 95% credible interval [Cr I]) by age group. Information on how these estimates are calculated can be found on CDC’s web page How CDC Estimates the Burden of Seasonal Influenza in the U.S.
| Symptomatic Illnesses | Medical Visits | Hospitalizations | Deaths | |||||
|---|---|---|---|---|---|---|---|---|
| Season | Estimate | 95% U I | Estimate | 95% U I | Estimate | 95% U I | Estimate | 95% U I |
| 2010-2011 | 21,000,000 | (20,000,000 – 25,000,000) | 10,000,000 | (9,300,000 – 12,000,000) | 290,000 | (270,000 – 350,000) | 37,000 | (32,000 – 51,000) |
| 2011-2012 | 9,300,000 | (8,700,000 – 12,000,000) | 4,300,000 | (4,000,000 – 5,600,000) | 140,000 | (130,000 – 190,000) | 12,000 | (11,000 – 23,000) |
| 2012-2013 | 34,000,000 | (32,000,000 – 38,000,000) | 16,000,000 | (15,000,000 – 18,000,000) | 570,000 | (530,000 – 680,000) | 43,000 | (37,000 – 57,000) |
| 2013-2014 | 30,000,000 | (28,000,000 – 33,000,000) | 13,000,000 | (12,000,000 – 15,000,000) | 350,000 | (320,000 – 390,000) | 38,000 | (33,000 – 50,000) |
| 2014-2015 | 30,000,000 | (29,000,000 – 33,000,000) | 14,000,000 | (13,000,000 – 16,000,000) | 590,000 | (540,000 – 680,000) | 51,000 | (44,000 – 64,000) |
| 2015-2016 | 24,000,000 | (20,000,000 – 33,000,000) | 11,000,000 | (9,000,000 – 15,000,000) | 280,000 | (220,000 – 480,000) | 23,000 | (17,000 – 35,000) |
| 2016-2017 | 29,000,000 | (25,000,000 – 45,000,000) | 14,000,000 | (11,000,000 – 23,000,000) | 500,000 | (380,000 – 860,000) | 38,000 | (29,000 – 61,000) |
| 2017-2018 | 41,000,000 | (35,500,000 – 53,000,000) | 21,000,000 | (18,000,000 – 27,000,000) | 710,000 | (560,000 – 1,100,000) | 52,000 | (3,000 – 95,500) |
| 2018-2019 | 28,000,000 | (24,000,000 – 40,000,000) | 13,000,000 | (11,000,000 – 18,000,000) | 370,000 | (300,000 – 660,000) | 27,000 | (19,000 – 96,000) |
| 2019-2020 | 35,000,000 | (28,000,000 – 71,000,000) | 16,000,000 | (13,000,000 – 30,000,000) | 390,000 | (310,000 – 740,000) | 24,000 | (17,000 – 85,000) |
| Preliminary estimates* | ||||||||
| 2021-2022* | 9,400,000 | (7,800,000 – 15,000,000) | 4,300,000 | (3,600,000 – 7,200,000) | 100,000 | (83,000 – 180,000) | 4,900 | (4,000 – 24,000) |
| 2022-2023* | 31,000,000 | (26,000,000 – 51,000,000) | 14,000,000 | (12,000,000 – 24,000,000) | 360,000 | (290,000 – 670,000) | 21,000 | (18,000 – 97,000) |
** Estimates are not available for the 2020-2021 flu season due to minimal influenza activity.
