Japanese encephalitis - MASTA Travel Health | For All Your Vaccination advice

Japanese encephalitis

Japanese encephalitis is a virus that can cause inflammation of the brain. Most cases occur in Asia – it is not found in Africa or Central or South America. The infection is quite rare, but the serious form has a fatality rate of 30%. There is a major outbreak of Japanese encephalitis every 2-15 years.
  • Symptoms Sudden fever, with vomiting and neck stiffness, sometimes leading to confusion, agitation and coma.
  • How do you catch Japanese encephalitis? The disease is spread by infected mosquitoes, which bite between dusk and dawn. Japanese encephalitis mainly occurs in rural agricultural areas.
  • Incubation period 5 – 15 days
  • Diagnosis Diagnosis is confirmed by blood tests.


Japanese encephalitis can be prevented by taking steps to avoid mosquito bites. A vaccine is available prior to travel following assessment by a travel nurse.


There is no cure for Japanese encephalitis. Supportive treatment aims to relieve symptoms and manage any complications.

Vaccination options

A licensed vaccine is available for adults and children.

Level of protection: ~96%

Protection duration: 1-2 years.

How is it given: 2 injections preferably @ 0 and 28 days. Rapid schedule may be considered.

Ideally start: 4-6 weeks before travel.

£105.00 Pricing shown is per dose

  • Japanese encephalitis is also carried by pigs and wading birds
  • High risk activities for Japanese encephalitis include camping, cycling and field work
  • Disease transmission can occur througout the year but the risk is higher during the rainy season
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