Influenza

Influenza is a viral infection that attacks your respiratory system — your nose, throat and lungs...

influenza, also called flu or grippe, an acute viral infection of the upper or lower respiratory ...

Influenza (flu) is a contagious viral infection that can cause mild to severe symptoms and life-t...

Influenza (flu) is a highly contagious viral infection of the respiratory tract that can cause se...

Seasonal influenza is characterized by a sudden onset of fever, cough (usually dry), headache, mu...