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Viral infection: Infection caused by the presence of a virus in the body. Depending on the virus and the person's state of health, various viruses can infect almost any type of body tissue, from the brain to the skin.iral infections cannot be treated with typical antibiotics (antibacterial antibiotics); in fact, in some cases the use of antibacterial antibiotics may cause side-effects that complicate the viral infection.
Probably the most common viral infection is the sinus infection, which produces sinusitis symptoms. Throat infections, ear infections, and respiratory infections are all caused by the cold virus. These infections include sore throat, the common cold and influenza, commonly known as the flu. viral infection is caused by exposure to viruses. Viruses are disease causing organisms that can invade the body and attach themselves to your cells. As they begin to mutate and reproduces themselves, their major function is to stop the cells from functioning properly.