Viral infection fever of 39 degrees has been high fever does not go down, should go to the hospital under the guidance of a professional doctor to apply antipyretic drugs, antiviral drugs, clearing heat and detoxification (clearing the body of heat and toxicity of the evil spirit) drugs, etc. for treatment, and if necessary, consider intravenous rehydration therapy. 1. Fever-reducing treatment: If the fever of 39 degrees for viral infections remains high, fever-reducing medicines, such as ibuprofen and acetaminophen, should be applied under the guidance of a doctor. 2. Antiviral treatment: For viral infections, antiviral drugs should be used as prescribed by the doctor, commonly used drugs include ribavirin, ganciclovir, oseltamivir and so on. 3. Heat-removing and detoxifying treatment: mainly with the application of heat-removing and detoxifying drugs, such as Pu Di Lan Anti-inflammatory Oral Liquid, Banlangen Granules and so on. 4. Intravenous fluid rehydration: If the viral infection fever of 39 degrees has been high fever does not go away, in order to avoid excessive loss of body fluids or too fast, but also with a professional doctor through the intravenous infusion of rehydration therapy, such as glucose sodium chloride potassium injection. If the viral infection fever 39 degrees has been high fever does not go down, it is recommended to go to the regular hospital as soon as possible, combined with the actual condition of targeted treatment. At the same time, also drink more boiled water, can replenish water, promote fever reduction.