Japanese Encephalitis

Sept. 18, 2025

Researchers have found that waning immunity against infections of the Japanese encephalitis virus (JEV) can predispose individuals to more severe dengue.

About Japanese Encephalitis:

  • It is a viral zoonotic disease caused by the Japanese Encephalitis(B) virus.
  • Japanese encephalitis virus (JEV) is a flavivirus related to dengue, yellow fever and West Nile viruses.
  • Transmission of Japanese Encephalitis:
    • The virus is transmitted to humans by the infected Culex mosquito of the Vishnui group.
    • There is no human-to-human transmission of the virus.
  • It is most common in rural areas of Asia, particularly during monsoon seasons when mosquito breeding is prevalent.
  • Both Japanese encephalitis virus and dengue virus belong to the same genus, 
  • Symptoms of Japanese Encephalitis:
    • It affects the brain, leading to symptoms like fever, headache, vomiting, and neurological signs such as confusion, seizures, and paralysis.
    • While many infected individuals may show mild or no symptoms, severe cases can lead to permanent brain damage or death.
  • Prevention and Treatment for Japanese Encephalitis
    • There is no antiviral treatment for patients with JE. Treatment is supportive and includes stabilization and relief of symptoms.  
    • Vaccination is the most effective prevention strategy, particularly in endemic regions.
    • According to the Government of India’s guidelines, two doses of the vaccine have been a part of the Universal Immunisation Programme since 2013.

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