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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.
A viral infection may also be caused by an insect bite. In a viral infection, the virus invades the inside of the body's cells in order to reproduce. A virus then spreads to other cells and repeats the process.This process of viral infection results in a variety of symptoms that vary in character and severity depending on the type of viral infection and individual factors.t is possible that a diagnosis of viral infection can be missed or delayed because some symptoms, such as fever, headache, nausea and vomiting, are similar to symptoms of other diseases.