Infectious Disease Compendium

Japanese encephalitis virus


A virus.

Epidemiologic Risks

Found from Pakistan through SE Asia, Japan, India, Eastern Russia and the Philippines. Transmitted by mosquitoes.


Diagnose with serology on blood or csf.

Could it be......encephalitis. But most (99%) are asymptomatic but 1 in 4 who get encephalitis die and at least 30% of the rest have neurological sequella.


Supportive. There is a vaccine (and it cross reacts with West Nile virus).


"JEV originated from its ancestral virus in the mid 1500s in the Indonesia-Malaysia region and evolved there into different genotypes, which then spread across Asia (PubMed)."

Last update: 05/05/18