Japanese Encephalitis Vaccine

What is Japanese Encephalitis?

Japanese Encephalitis (JE) is a viral infection of the brain caused by the Japanese Encephalitis virus, transmitted through the bites of infected Culex mosquitoes. It is the leading cause of viral encephalitis in Asia, with an estimated 68,000 clinical cases occurring annually.

Most infections are mild or asymptomatic, however approximately 1 in 250 infections develops into severe encephalitis. Of those who develop severe disease, 20 to 30% die and 30 to 50% suffer permanent neurological complications. There is no specific antiviral treatment — vaccination is the most effective prevention.

Do I need this vaccine?

Japanese Encephalitis vaccination is recommended for travellers spending time in rural or agricultural areas of Asia, particularly during the transmission season. Risk is higher during and after monsoon season when mosquito populations peak.

How many doses do I need?

The standard primary course consists of 2 doses given 28 days apart. A rapid course is available for adults aged 18 to 64. A booster dose may be recommended for those at continued risk.