Japanese encephalitis vaccine (Ixiaro) eligibility
From 2 months of age. For longer or rural stays in South and East Asia. Two doses before travel. Not live. Private only.
Last reviewed 12 September 2026UK Green Book ch. 20Non-live vaccine
Who can have it
Eligibility by age, on the NHS and privately
Japanese encephalitis is a rare but serious mosquito-borne infection of the brain, found in rural parts of Asia, particularly around rice fields and pig farms. The risk for short city breaks is very low. The vaccine is advised for stays of a month or more, rural travel, or travel during the wet season.
Check what applies to you
Pick your age range and gender to see only the criteria for your group. Nothing you select is saved or sent anywhere.
Age
Privately (pharmacy or clinic)
On the NHS
Under 2 years
PrivatelyRestrictions apply
From 2 months at a half (0.25 ml) dose
On the NHSNot offered
Not available on the NHS.
2 to 17 years
Privately✓Available
Half dose until the third birthday; full dose from age 3
On the NHSNot offered
Not available on the NHS.
18 to 49 years
Privately✓Available
Two doses 28 days apart, or a rapid 7-day schedule
On the NHSNot offered
Not available on the NHS.
50 to 64 years
Privately✓Available
Two doses 28 days apart, or a rapid 7-day schedule
On the NHSNot offered
Not available on the NHS.
65 and over
Privately✓Available
Two doses 28 days apart. The rapid 7-day schedule is licensed for 18 to 64 only, though it can be used off-licence when time is short
On the NHSNot offered
Not available on the NHS.
Recommended for
Travellers spending a month or more in rural Asia, particularly during or just after the rainy season
Shorter trips involving extensive outdoor or rural activity, such as cycling, camping or farm stays
Expatriates and long-stay workers in endemic areas
Who should not have it
A previous serious allergic reaction to the vaccine or one of its ingredients
If you have a fever, the vaccine is usually postponed
Always tell the clinician about allergies, medicines, health conditions and recent vaccines. They will confirm the vaccine is right for you before giving it.
About the vaccine
What it protects against, how long it lasts and side effects
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Protects against
Mosquito-borne viral inflammation of the brain, mainly in rural areas of South and East Asia.
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When to have it
At least 1 week before travel (2 doses required)
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How long it lasts
1–3 years depending on vaccine brand
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Doses
2 doses — 28 days apart
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Side effects
Sore arm, headache, muscle aches, or fatigue. Rare: delayed hypersensitivity reaction (urticaria or angioedema) within 1–10 days.
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Good to know
Risk is highest in rice-farming areas and near pig farms where mosquitoes breed.
Common questions
Japanese encephalitis vaccine (Ixiaro): your questions answered
Do I need the Japanese encephalitis vaccine for a two-week holiday in Thailand?
Usually not if you are staying in cities and resorts. It becomes worthwhile for longer stays, rural travel, or outdoor activities in the countryside, especially in the wet season. A travel clinic can assess your itinerary.
How long before travel do I need to start?
The standard course is two doses 28 days apart, finishing at least a week before travel, so start five weeks ahead. Adults aged 18 to 65 can use a rapid course with doses 7 days apart.
How long does the vaccine last?
One to two years after the primary course. A booster is given 12 to 24 months later (at 12 months for those at ongoing risk, and considered at 12 months for over-65s). Further boosters depend on continued risk and clinician advice.
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GPhC-registered pharmacies and travel clinics. The clinician confirms suitability at your appointment.
General information only. This page sets out the published UK eligibility criteria so you can see which apply to you. It is not medical advice and VaxiGo does not assess your suitability for any vaccine. The clinician at your appointment makes that decision with you.