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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.
Viral infections occur when a virus enters the body and invades the inside of the bodyâs cells in order to reproduce. If the bodyâs immune system is unable to fight off the virus, it multiplies and spreads to other cells, repeating the process and leading to a widespread infection.iral infections occur when a virus enters the body and invades the inside of the bodyâs cells in order to reproduce. If the bodyâs immune system is unable to fight off the virus, it multiplies and spreads to other cells, repeating the process and leading to a widespread infection.