West Nile Virus

MedicineNet - West Nile Virus Symptoms and Signs

Symptom Checker: Symptoms & Signs Index

Medical Author:

Symptoms & Signs

Most people infected with the West Nile virus do not develop an illness or any symptoms from the infection. However, an illness with fever occurs in about one out of every five people who become infected. The illness produces flu-like symptoms, including fever, chills, body aches, joint pains, diarrhea, vomiting, headache, fatigue, weakness, or rash. Rarely, in less than 1% of people who are infected, a serious illness with neurological complications develops. These people may develop inflammation of the brain (encephalitis) or the membranes surrounding the brain and spinal cord (meningitis). In this case, symptoms like high fever, neck stiffness, disorientation, coma, tremors, seizures, or paralysis can occur. Other possible symptoms of severe West Nile virus illness can include difficulty walking and sleepiness. Long-term persistent effects of the severe illness can cause insomnia, depression, memory loss, confusion, irritability, and fatigue.

Medically Reviewed by a Doctor on 1/14/2014

Health concern on your mind? Visit the Symptom Checker.


United States. Centers for Disease Control and Prevention. "West Nile Virus." Nov. 22, 2013. <http://www.cdc.gov/westnile/symptoms/>.

Main Article on West Nile Virus Symptoms and Signs
West Nile Virus Symptoms and Signs
Examples of Medications for West Nile Virus Symptoms and Signs
  • acetaminophen, Tylenol and Others
  • Nonsteroidal Antiinflammatory Drugs (NSAIDs)

Women's Health

Find out what women really need.