Estimated Influenza Illnesses, Medical visits, and Hospitalizations Averted by Vaccination
For the past several years, CDC has estimated the burden of influenza and the impact of annual influenza vaccination in the United States. CDC finds these estimates using a model that estimates the numbers of flu illnesses, medical visits and hospitalization prevented by vaccination using season-specific data on burden of disease, vaccine coverage and vaccine effectiveness (VE). Variations in these three inputs can impact both the burden of disease and the burden averted by vaccination from season to season. CDC uses the estimates of the burden of influenza in the population and the impact of influenza vaccination to inform policy and communications related to influenza.
How CDC Estimates Burden Averted
CDC estimates the numbers of flu illnesses, medical visits and hospitalization prevented by vaccination using season-specific data on burden of disease, vaccine coverage and vaccine effectiveness (VE).
Why CDC Estimates Burden Averted
CDC uses the estimates of the burden of flu in the population and the impact of influenza vaccination to inform policy and communications related to seasonal flu.
Past Seasons’ Burden Averted Estimates
At the end of each flu season, CDC estimates the burden of flu prevented by vaccination. Past reports on the burden of flu averted by flu vaccination can be found online.
508 Compliant Text:
2017-2018 Flu Season: Flu Burden and Flu Burden Averted by Vaccination
During the 2017-2018 flu season, CDC estimates flu caused:
49 million flu illnesses, 960,000 flu hospitalizations, 79,000 flu deaths
This severe season could have been worse without flu vaccines.
Approximately 40% if the U.S. population chose to get a flu vaccine during the 2017-2018 flu season, and this prevented an estimated:
7 million, about the population of New York City.
109,000, or about the number of vehicles crossing the Golden Gate Bridge each day.
8,000, or twice the number of hospitals in the U.S.
Imagine the impact if more Americans chose to get a flu vaccine.
Many more flu illnesses, flu hospitalizations and flu deaths could be prevented.
Get vaccinated
Supporting Research
Flu-related illness and hospitalization averted by vaccination
2016-2017 season
- Study: Estimated Influenza Illnesses, Medical visits, and Hospitalizations Averted by Vaccination in the United States. CDC web site.
2015-2016 season
- Study: Estimated Influenza Illnesses, Medical Visits, Hospitalizations, and Deaths Averted by Vaccination in the United States. CDC web site.
- Web article: CDC: Flu Vaccine Protected Millions Last Season; Vaccine Coverage Remains Low.
2014-2015 season
- Study: Estimated Influenza Illnesses and Hospitalizations Averted by Vaccination — United States, 2014–15 Influenza Season. CDC web site.
- Web article: Fewer Than Half of Americans Report Having Gotten A Flu Vaccine this Season.
2013-2014 season
- Study: Estimated Influenza Illnesses and Hospitalizations Averted by Vaccination — United States, 2013–14 Influenza Season. MMWR.
- Web article: New CDC Report Shows Benefits of Flu Vaccine Last Season But Fewer Than Half of Americans Say They Have Been Vaccinated This Season.
2012-2013 season
- Study: Estimated influenza illnesses and hospitalizations averted by influenza vaccination—United States, 2012–13 influenza season. MMWR.
- Web article: New Report Cites Benefits of Flu Vaccine Yet More Than Half of Americans Remain Unvaccinated.
- Study: Modeling the Effect of Different Vaccine Effectiveness Estimates on the Number of Vaccine-Prevented Influenza-Associated Hospitalizations in Older Adults [136 KB, 4 pages]. Clin Infect Dis.
- Web article: CDC Study Concludes Flu Vaccination Prevents Hospitalizations in Older People.
2011-2012 season
- Study: Effectiveness of influenza vaccine for preventing laboratory-confirmed influenza hospitalizations in adults, 2011-2012 influenza season [88 KB, 4 pages]. Clin Infect Dis.
- Web article: Study Shows Flu Vaccination Prevents Hospitalizations in Older Adults.
2005-2011 seasons
- Study: Case-control study of vaccine effectiveness in preventing laboratory-confirmed influenza hospitalizations in older adults, United States, 2010-2011. Clin Infect Dis.
- Web article: New CDC Study: Influenza Vaccination Reduces Risk of Hospitalization By More Than Half Among Seniors.
- Study: Influenza Illness and Hospitalizations Averted by Influenza Vaccination in the United States, 2005-2011. PLoS One.
- Web article: CDC Study Shows Flu Vaccination Prevents Significant Flu Illness, Doctor’s Visits and Hospitalizations.
Flu-related deaths averted by vaccination
Infographic
- Page last reviewed: March 18, 2019
- Page last updated: March 18, 2019
- Content source:
- Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (NCIRD)
- Page maintained by: Office of the Associate Director for Communication, Digital Media Branch, Division of Public Affairs