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 | (16,000,000 – 46,000,000) | 10,000,000 | (7,900,000 – 21,000,000) | 280,000 | (190,000 – 1,000,000) | 36,000 | (21,000 – 140,000) |
2011-2012 | 9,300,000 | (8,600,000 – 12,000,000) | 4,300,000 | (4,000,000 – 5,600,000) | 130,000 | (120,000 – 180,000) | 12,000 | (10,000 – 23,000) |
2012-2013 | 33,000,000 | (26,000,000 – 66,000,000) | 15,000,000 | (12,000,000 – 30,000,000) | 570,000 | (360,000 – 1,800,000) | 42,000 | (25,000 – 110,000) |
2013-2014 | 29,000,000 | (24,000,000 – 41,000,000) | 13,000,000 | (12,000,000 – 15,000,000) | 340,000 | (260,000 – 640,000) | 37,000 | (23,000 – 100,000) |
2014-2015 | 30,000,000 | (26,000,000 – 39,000,000) | 14,000,000 | (11,000,000 – 18,000,000) | 590,000 | (410,000 – 1,100,000) | 51,000 | (34,000 – 100,000) |
2015-2016 | 23,000,000 | (19,000,000 – 32,000,000) | 10,000,000 | (9,000,000 – 14,000,000) | 270,000 | (210,000 – 480,000) | 22,000 | (17,000 – 35,000) |
2016-2017 | 29,000,000 | (24,000,000 – 44,000,000) | 13,000,000 | (11,000,000 – 22,000,000) | 490,000 | (370,000 – 830,000) | 38,000 | (28,000 – 60,000) |
2017-2018 | 41,000,000 | (35,000,000 – 53,000,000) | 18,000,000 | (16,000,000 – 24,000,000) | 710,000 | (560,000 – 1,100,000) | 51,000 | (36,000 – 95,000) |
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 – 70,000,000) | 16,000,000 | (13,000,000 – 30,000,000) | 390,000 | (310,000 – 720,000) | 25,000 | (18,000 – 78,000) |
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.