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% Cr I | Estimate | 95% Cr I | Estimate | 95% Cr I | Estimate | 95% Cr 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 * | 25,000,000 | (24,000,000 – 28,000,000) | 12,000,000 | (11,000,000 – 13,000,000) | 310,000 | (290,000 – 340,000) | 25,000 | (21,000 – 31,000) |
| 2016-2017 * | 30,000,000 | (28,000,000 – 32,000,000) | 14,000,000 | (13,000,000 – 16,000,000) | 580,000 | (520,000 – 660,000) | 51,000 | (44,000 – 64,000) |
| 2017-2018 * | 49,000,000 | (46,000,000 – 53,000,000) | 23,000,000 | (21,000,000 – 25,000,000) | 960,000 | (870,000 – 1,100,000) | 79,000 | (69,000 – 99,000) |
* Estimates from the 2015-2016, 2016-2017, and 2017-2018 seasons are preliminary and may change as data are finalized.
Page last reviewed: October 25, 2018