U.S. Food and Drug Administration

Flu Information

"The flu" is caused by the influenza virus, which infects the respiratory tract (nose, throat, lungs). Unlike many other viral respiratory infections, such as the common cold, the flu may cause severe illness and life-threatening complications in certain people.

For access to U.S. Government Avian and Pandemic Influenza (Flu) information,
please visit PandemicFlu.gov

Seasonal Flu Information


Health Professionals



Industry: Research and Development

Other Information

nurse immunizing a patient