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 - Northwestern Memorial Hospital - Chicago


Influenza is commonly known as "the flu." Every year, there are a number of different influenza viruses circulating the world and causing flu-like symptoms in people who become infected. 

In a typical year, the seasonal flu affects between 5 and 20 percent of the population in the United States, and approximately 36,000 people die from complications of the flu. Most cases of the seasonal flu occur between late fall and early spring.

Flu Self-Screening Questionnaires

If you think you might have the flu, or you think you've been exposed to someone who does, you may want to take our self-screening tests.

Last UpdateFebruary 8, 2011