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Living with Japanese encephalitis virus disease

A viral infection spread by insects that can cause brain inflammation, fever, and headache.

Understanding Japanese encephalitis virus disease

Japanese encephalitis is a disease caused by a virus that is transmitted by an arthropod, such as an insect.

The virus can cause inflammation of the brain (encephalitis). GARD lists a range of symptoms, from fever and headache to seizures, muscle weakness, and changes in alertness. It can occur at any time in life. It affects both infectious and neurological systems.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Fever and chills
  • Headache
  • Brain inflammation (encephalitis)
  • Seizures
  • Changes in alertness (reduced consciousness)
  • Muscle weakness and aches

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 Japanese encephalitis diagnosed?
Which symptoms mean I should go to the hospital quickly?
How can I lower the risk of infection when traveling?

Quick facts

Symptoms usually startany time in life

It is caused by a virus that is passed on by an arthropod, a type of insect-like animal. GARD does not give further details.

InfectiousNeurological

Also known as: encephalitis, japanese; japanese b encephalitis; japanese encephalitis; jbe - japanese b encephalitis; je - japanese encephalitis

Patient organizations

Source: NIH GARD · Japanese encephalitis virus diseaseGARD ID 6797 · 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 Japanese encephalitis virus disease.

Explore the Japanese encephalitis virus disease blog

Explore research for Japanese encephalitis virus disease

Explore actively recruiting Japanese encephalitis virus disease studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Japanese encephalitis virus disease 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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