There is no specific treatment for West Nile viral illness. Because West Nile infections are caused by a virus, antibiotics are not an effective treatment. Therefore, treatment is supportive. It is aimed at improving the symptoms of an infected person but does not shorten the course of illness. Treatment typically includes controlling fever and avoiding dehydration. More severe cases may require hospitalization and intensive care including intravenous fluids, respiratory support, and prevention of secondary infections. Mild symptoms will usually resolve in a few days.