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About Viral Infections

A viral infection is an infection caused by the presence of a virus in the body. 

A respiratory (lung) viral infection refers to a virus that specifically affects the upper (nose, mouth, throat) or lower (deeper within the lungs – trachea, bronchi, bronchioles) respiratory tracts, or both. Viral infections usually happen through the mouth or nose from tiny respiratory droplets produced when someone coughs, sneezes, or talks.