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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.
(pathology) A disease that is infectious. Supplement. Infection is the process or the state wherein an infectious agent (such as pathogenic microorganisms, viruses, prions, viroids, nematodes and helminths) invade and multiple in the body tissues of the host.It could result to the manifestation of symptoms and disease when the immune response of the host is activated.It may also be palpable when the infection results in the competition in nutrients and metabolism. The invading microbes and viruses are also capable of producing pyrogens that can incite febrile reaction.nfection is the process or the state wherein an infectious agent (such as pathogenic microorganisms, viruses, prions, viroids, nematodes and helminths) invade and multiple in the body tissues of the host.