Flu Facts

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. Most healthy people recover from the flu without problems, but certain people are at high risk for serious complications.

Extensive efforts are underway to track and monitor the spread of all flu viruses. In the U.S., epidemiologists at the Centers for Disease Control (CDC) are working with states to collect, compile and analyze reports of flu outbreaks.

CDC Flu Trends is the Centers for Disease Control website monitoring flu activity for the United States.

CDC Immunization
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