
About the Flu
Flu refers to illnesses caused by a number of different influenza viruses. Flu can cause a range of symptoms and effects, from mild to lethal. Two strains of flu, seasonal flu and the H1N1 (Swine) flu, are currently circulating in the United States. A third, highly lethal H5N1 (Bird) flu is being closely tracked overseas. Most healthy people recover from the flu without problems, but certain people are at high risk for serious complications.
Who's at high risk for the flu?