Past Seasons Estimated Influenza Disease Burden
Past Seasons
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 | 29,000,000 | (25,000,000 – 40,000,000) | 17,000,000 | (11,500,000 – 18,500,000) | 380,000 | (300,000 – 66,000) | 28,000 | (19,000 – 97,000) |
2019-2020 | 36,000,000 | (29,000,000 – 71,000,000) | 16,000,000 | (13,000,000 – 32,000,000) | 390,000 | (313,000 – 750,000) | 25,000 | (18,000 – 79,000) |
Preliminary estimates* | ||||||||
2021-2022* | 9,000,000 | (7,700,000 – 15,000,000) | 4,000,000 | (3,600,000 – ,300,000) | 100,000 | (82,000 – 176,000) | 5,000 | (3,700 – 20,000) |
** Estimates are not available for the 2020-2021 flu season due to minimal influenza activity.