Past Seasons Estimated Influenza Disease Burden Averted by Vaccination

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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 2014–2015 through the 2019-2020 influenza seasons.

Table 1: Estimated Number of Influenza Illnesses, Medical Visits, Hospitalizations, and Deaths Averted by Vaccination, by Age Group, 2010-11 through 2017-18 Influenza Seasons
​ Averted Symptomatic Illnesses Averted Medical Visits Averted Hospitalizations Averted 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* 6,200,000 (2,100,000, 12,000,000) 3,200,000 (1,200,000, 6,100,000) 91,000 (16,000, 270,000) 5,700 (340, 23,000)
2018-2019* 4,400,000 (3,400,000, 7,100,000) 2,300,000 (1,800,000, 3,800,000) 58,000 (30,000, 160,000) 3,500 (1,000, 13,000)
2019-2020* 7,500,000 (5,800,000, 9,400,000) 3,700,000 (2,800,000, 4,600,000) 105,000 (59,000, 160,000) 6,300 (2,800, 11,000)

* Estimates from the 2017-2018, 2018-2019, and 2019-2020 seasons are preliminary and may change as data are finalized.

Page last reviewed: October 1, 2020
Content source: Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (NCIRD)