Japanese encephalitis is rare in travelers but potentially devastating — about 30% of symptomatic cases are fatal, and up to 50% of survivors have permanent neurological damage. The vast majority of infections (99%) are asymptomatic or cause only mild illness.
The virus is transmitted by Culex tritaeniorhynchus mosquitoes, which breed in rice paddies and bite at dusk. Risk is concentrated in rural agricultural areas of East and Southeast Asia, particularly during and after monsoon season when rice cultivation and mosquito populations peak.
A safe and effective vaccine is available and recommended for travelers spending more than one month in rural endemic areas. Short-stay urban visitors are at very low risk.
Culex tritaeniorhynchus — a night-biting species closely associated with rice cultivation and pig farming.
Long-stay travelers in rural Southeast and East Asia during monsoon season. Children under 15 and adults over 65 are more vulnerable. A vaccine is available and recommended for extended trips.
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Disease information is sourced from WHO, CDC, ECDC, and OpenDengue. This is not medical advice — consult a healthcare professional for diagnosis and treatment.