2011-2012 Estimated Influenza Illnesses, Medical Visits, Hospitalizations, and Deaths Averted by Vaccination in the United States

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CDC estimates that influenza vaccination during the 2011-2012 influenza season prevented 2.2 million illnesses, 1.1 million medical visits, 44,000 hospitalizations and 4,200 deaths associated with influenza (Table: Estimated Number of Influenza Illnesses, Medical Visits, Hospitalizations, and Deaths Averted by Vaccination, 2010-11 through 2017-18 Influenza Seasons).

Table 1: Estimated Number of Influenza Illnesses, Medical Visits, Hospitalizations, and Deaths Averted by Vaccination, by Age Group — United States, 2011-2012 influenza season
Averted illnesses Averted medical visits Averted hospitalizations Averted deaths
Age group Estimate 95% UI* Estimate 95% UI* Estimate 95% UI* Estimate 95% UI*

6 mo-4 yrs

 274,844 (48,386, 895,787) 184,146 (33,893, 596,804) 1,916 (337, 6,245) 0 (0, 0)

5-17 yrs

 550,689 (204,757, 3,585,298) 286,358 (110,170, 1,847,583) 1,510 (561, 9,831) 0 (0, 0)

18-49 yrs

 468,021 (154,724, 3,209,490) 173,168 (60,909, 1,151,662) 2,627 (868, 18,015) 100 (20, 1,050)

50-64 yrs

 548,223 (138,810, 5,768,458) 235,736 (62,872, 2,413,731) 5,814 (1,472, 61,173) 662 (159, 9,186)

65+ yrs

 355,677 (0, 2,998,465) 199,179 (0, 1,649,387) 32,334 (0, 272,588) 3,452 (0, 35,199)

All ages

 2,197,454 (829,764, 11,620,518) 1,078,587 (411,999, 5,411,163) 44,201 (4,881, 320,697) 4,214 (322, 40,813)

* Uncertainty Interval

Table 2: Estimated Fraction of  Influenza Hospitalizations Averted by Vaccination by age group — United States, 2011-2012 influenza season
Age Group Estimate 95% UI*

6 mo-4 yrs

 33 (8, 47)

5-17 years

 22 (12, 30)

18-49 years

 12 (6, 17)

50-64 years

 23 (10, 31)

65+ years

 28 (0, 47)

*Uncertainty Interval