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Seasonal Influenza: The Disease

Influenza (the flu) is a contagious respiratory illness caused by influenza viruses (opens in a new tab). It can cause mild to severe illness, and at times can lead to death. Some people, such as older people, young children, and people with certain health conditions (opens in a new tab), are at high risk for serious flu complications. The best way to prevent the flu is by getting vaccinated each year.

To learn more:

Source: Centers for Disease Control and Prevention (opens in a new tab)