<P> There are a number of symptoms that are characteristic of lower respiratory tract infections . The two most common are bronchitis and cancer and edema . Influenza affects both the upper and lower respiratory tracts . </P>
<P> There are a number of symptoms that are characteristic of lower respiratory tract infections . The two most common are bronchitis and cancer and edema . Influenza affects both the upper and lower respiratory tracts . </P>
acute viral infection of upper and lower respiratory tracts is called
acute viral infection of upper and lower respiratory tracts is called
Influenza
Influenza