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Flu Science

How Flu Spreads

About 5% to 20% of the U.S. population gets the flu every year. The CDC estimates that there have been 9 to 41 million flu illnesses a year between 2010 and 2020.

While getting vaccinated is the most effective way of avoiding the flu, understanding how the flu spreads is a big step towards prevention.

Sep 6, 2022
Woman on bus coughing into the crook of her arm

Flu Burden

How Flu Creates a Burden on Society

Read about the impact of seasonal flu—and of vaccinations.

Sep 7, 2022
Older man with eyes closed, holding head with one hand

Flu Complications

Why Does Flu Affect Some People More Than Others?

Certain people may have higher risk factors for influenza complications.

Sep 5, 2022