What is influenza (flu)?
Influenza (or flu) is a highly contagious viral respiratory tract infection. An estimated 5 to 20 percent of the population in the US contract influenza each year. Influenza is characterized by the abrupt onset of fever, muscle aches, sore throat, and a nonproductive cough.
More about the flu
Three Easy Steps to Fighting the Flu
- Take time to get a flu vaccine
- Take everyday preventive actions to stop the spread of germs
- Take flu antiviral drugs if your doctor prescribes them