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West Nile virus (WNV) is an infectious disease that first appeared in the United States in 1999. Infected mosquitoes spread the virus that causes it. People who get WNV usually have no symptoms or mild symptoms. The symptoms include a fever, headache, body aches, skin rash, and swollen lymph glands. They can last a few days to several weeks, and usually go away on their own.

If West Nile virus enters the brain, however, it can be life-threatening. It may cause inflammation of the brain, called encephalitis, or inflammation of the tissue that surrounds the brain and spinal cord, called meningitis. A physical exam, health history and laboratory tests can diagnose it.

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Photograph of a mosquito on human skin
Results 1 - 10 of 124 for west nile virus
  1. West Nile Virus (National Library of Medicine)  
    West Nile virus (WNV) is an infectious disease that first appeared in the United States in 1999. Infected mosquitoes ... and usually go away on their own. If West Nile virus enters the brain, however, it can be life- ...
  2. FAQ: General Questions about West Nile Virus (Centers for Disease Control and Prevention)  
    ... Nile Virus Share Compartir FAQ: General Questions About West Nile Virus What is West Nile virus? How do people ... numbers of West Nile virus cases? What is West Nile virus? West Nile virus is an arthropod-borne virus ( ...
  3. FAQ: West Nile Virus and Dead Birds (Centers for Disease Control and Prevention)  
    ... CDC.gov . West Nile Virus Share Compartir FAQ: West Nile Virus & Dead Birds How do birds get infected with ... local authorities. How do birds get infected with West Nile virus? West Nile virus is transmitted to birds through ...
  4. Understanding West Nile Virus From the National Institutes of Health (National Institute of Allergy and Infectious Diseases)  
    ... JavaScript on. Read more information on enabling JavaScript. West Nile Virus Skip Content Marketing Share this: Main Content Area Understanding West Nile Virus The West Nile Virus first emerged in the ...
  5. West Nile Virus: Prevention and Control (Centers for Disease Control and Prevention)  
    ... birdbaths on a regular basis. Help Your Community West Nile Virus Surveillance and Control Programs Support your local community ... Mosquito Surveillance Software Health Education Public Service Videos West Nile Virus in Spanish Preguntas frecuentes: Preguntas generales sobre el ...
  6. West Nile Virus (Nemours Foundation)  
    ... Manage a Serious Allergic Reaction Quiz: Baseball Injuries West Nile Virus KidsHealth > Teens > Infections > Bacterial & Viral Infections > West Nile Virus Print A A A Text Size What's in ...
  7. What's West Nile Virus? (Nemours Foundation)  
    ... Works Main Page The Pink Locker Society What's West Nile Virus? KidsHealth > Kids > Illnesses & Injuries > Aches, Pains & Injuries > What's West Nile Virus? Print A A A Text Size What exactly ...
  8. West Nile Virus in the Workplace (National Institute for Occupational Safety and Health)  
    ... Home Workplace Safety & Health Topics NIOSH Share Compartir WEST NILE VIRUS On this Page Overview NIOSH Publications CDC Resources Other Resources Overview The West Nile virus (WNV) is most often spread to people from ...
  9. NIAID's Role in Addressing West Nile Virus From the National Institutes of Health (National Institute of Allergy and Infectious Diseases)  
    ... JavaScript on. Read more information on enabling JavaScript. West Nile Virus Top Banner Content Area Skip Content Marketing Share ... begin feeding on a human host. Credit: CDC West Nile virus (WNV) first emerged in the Western Hemisphere in ...
  10. West Nile Virus: Symptoms and Treatment (Centers for Disease Control and Prevention)  
    ... Mosquito Surveillance Software Health Education Public Service Videos West Nile Virus in Spanish Preguntas frecuentes: Preguntas generales sobre el ...
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