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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.
What is a viral syndrome? A person with a viral syndrome has a combination of symptoms that are common in those with a viral infection. Viral syndrome is a diagnosis that a doctor may use when symptoms suggest a viral illness, but the specific virus has not been identified. What are the symptoms of a viral syndrome? Symptoms of a viral syndrome include fever, muscles aches, joint pains, fatigue, and headache. Additional symptoms may include sinus congestion, sore throat, swollen glands, cough, nausea, vomiting, diarrhea, and a rash.