About Flu
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Note: Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices — United States, 2017–18 Influenza Season is available. Content throughout the rest of the influenza web site will be updated in the coming weeks. Refer to the 2017-2018 document for information specific to the 2017-2018 influenza season.
Influenza (flu) is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness. Serious outcomes of flu infection can result in hospitalization or death. Some people, such as older people, young children, and people with certain health conditions, are at high risk of serious flu complications.
The best way to prevent the flu is by getting vaccinated each year.
Information for People at High Risk
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- Page last reviewed: October 5, 2017
- Page last updated: October 5, 2017
- 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