Seasonal influenza is a major global health concern. Worldwide, annual influenza epidemics result in three to five million cases of severe illness, and about 250,000 to 500,000 deaths. In industrialized countries, most deaths associated with influenza occur among people age 65 or older, who are also 10-30 times more likely to be hospitalized due to influenza-related complications.

In the United States, the overall burden of influenza disease during 2014-2015 across all ages was 40 million flu illnesses, 19 million flu-associated medical visits and 970,000 flu-associated hospitalizations resulting in more than 36,000 deaths due to influenza-related complications.

You play an important role in stopping the spread of flu, not just to yourself but to others. As a doctor and public health professional who has treated many people with influenza, I’ll explain why.

And no, getting the vaccine will not give you the flu.