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Living with West-Nile encephalitis

A form of West Nile virus infection that reaches the brain and nervous system.

Understanding West-Nile encephalitis

West Nile encephalitis is a form of West Nile virus infection that affects the nervous system.

West Nile virus is usually spread to people by infected mosquitoes. Encephalitis occurs when the virus crosses the blood-brain barrier and infects the central nervous system. Anyone can be affected, but risk is highest in people over 60, organ transplant recipients, and people with certain conditions such as cancer, diabetes, high blood pressure, and kidney disease.

Signs & symptoms

Symptoms vary from person to person. GARD lists these:

  • Headache
  • Fever
  • Stiff neck
  • Confusion (disorientation)
  • Tremors
  • Seizures or paralysis

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and seizure and epilepsy specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Seizure and epilepsy specialists (epileptologist)
Expert care
Expert lists: Epilepsy Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Encephalitis411 and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
How is West Nile encephalitis confirmed?
What care helps with symptoms like fever and headache?
Does my health history raise my risk of complications?

Quick facts

Symptoms usually startany time in life

GARD says the virus is generally spread by infected mosquitoes. Encephalitis occurs when it infects the central nervous system.

InfectiousNeurological

Also known as: west nile encephalitis; west nile fever encephalitis; west nile fever with encephalitis; west nile virus caused infectious encephalitis; west nile virus infectious encephalitis; west-nile fever

Patient organizations

Source: NIH GARD · West-Nile encephalitisGARD ID 9959 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with West-Nile encephalitis.

Explore the West-Nile encephalitis blog

Explore research for West-Nile encephalitis

Explore actively recruiting West-Nile encephalitis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for West-Nile encephalitis with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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