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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 gastroenteritis is an inflammation of the stomach and intestines caused by one of any number of viruses. Also known as the stomach flu, viral gastroenteritis can affect anyone throughout the world. This highly contagious illness spreads through close contact with people who are infected, or through contaminated food or water.