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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.
The difference between a bacterial infection and a viral infection can make the difference between a life threatening condition and a harmless one, so you might want to read on. Bacterial infections are caused by bacteria and viral infections are caused by viruses.