Japanese Encephalitis Vaccine: When You Need It and Where to Get It

The Japanese encephalitis vaccine is one of the most-asked-about — and most misunderstood — jabs we discuss at our travel clinic. Some travellers heading to Thailand for a fortnight of beaches assume they need it; others spending three months cycling through rural Vietnam in the rainy season don't realise they do. As pharmacist prescribers at Brookfield Pharmacy in Hucclecote, here's our plain-English guide to who genuinely needs the Japanese encephalitis vaccine, how the course works, what it costs in the UK, and where to get it in Gloucester.

What is Japanese encephalitis?

Japanese encephalitis (JE) is a viral infection spread by Culex mosquitoes across much of Asia and parts of the western Pacific. The virus circulates between mosquitoes, pigs and wading birds — which is why the risk clusters around rice paddies, irrigated farmland and pig farms rather than city centres.

Most people who are infected never develop symptoms. The problem is the small minority who do: the infection can cause inflammation of the brain (encephalitis), with fever, headache, confusion, seizures and, in severe cases, coma. There's no specific antiviral treatment. Of those who develop encephalitis, around 1 in 4 die, and up to half of survivors are left with lasting neurological problems.

So the headline for travellers is: the chance of catching it is low, but the consequences if you're unlucky are serious. That's exactly why the decision about vaccination is individual rather than blanket.

Where is Japanese encephalitis found?

JE is present across South and Southeast Asia, East Asia and parts of the Pacific, including:

• Southeast Asia: Thailand, Vietnam, Cambodia, Laos, Myanmar, Malaysia, the Philippines, Indonesia
• South Asia: India, Nepal, Bangladesh, Sri Lanka, Bhutan
• East Asia: China, South Korea, Taiwan, Japan (where childhood vaccination keeps human cases low)
• Pacific: Papua New Guinea and, more recently, parts of northern and eastern Australia

Risk isn't evenly spread within a country. It's highest in rural and agricultural areas, and it follows the seasons: in temperate regions transmission peaks in summer and autumn; in tropical regions it's linked to monsoon travel and the rainy season, though in some areas it happens year-round.

We check the latest country-specific guidance (from the UK's National Travel Health Network and Centre) for your exact itinerary during the consultation.

Who needs the Japanese encephalitis vaccine?

UK guidance recommends considering the vaccine for travellers who will be:

• Staying a month or longer in an at-risk area during the transmission season — for example, long-term backpackers, gap-year travellers, volunteers and people relocating
• Taking shorter trips with significant rural exposure — trekking, cycling, camping, working on farms, or staying near rice fields and pig farming, especially in the rainy season
• Going repeatedly to endemic areas, where the total time adds up
• Working with the virus in a laboratory

Who probably doesn't need it

If you're spending two weeks in Bangkok, Singapore or Hong Kong, staying in air-conditioned hotels and mostly sticking to cities and resort beaches, your risk of Japanese encephalitis is extremely low and the vaccine usually isn't recommended. That's the honest answer — and one of the reasons we'd always rather assess your itinerary than sell you every vaccine on the list.

The grey zone is the traveller doing a bit of both: a couple of weeks of cities plus a few days of homestays in the Mekong Delta or the rice terraces of northern Vietnam or Bali. That's where a proper conversation about where, when and how you'll be travelling makes the difference.

The JE vaccine UK schedule

The Japanese encephalitis vaccine used in the UK (Ixiaro) is an inactivated vaccine — it doesn't contain live virus — given as an injection into the upper arm.

A few practical points:

• Finish the course at least a week before you travel. Protection develops after the second dose, so for the standard schedule that means starting at least five weeks before departure.
• Short on time? The rapid schedule fits both doses into a week for most adults. It's one of the best reasons to book a travel appointment as soon as the trip is booked.
• Children receive a smaller dose under the age of three, but the schedule is the same.
• Side effects are usually mild — a sore arm, headache or muscle ache for a day or two.

The vaccine can generally be given at the same appointment as other travel vaccines such as hepatitis A, typhoid or rabies.

How much does the Japanese encephalitis vaccine cost?

The JE vaccine isn't available free on the NHS for travel, so it's a private vaccine wherever you get it. At Brookfield Pharmacy it's:

That price includes your consultation and risk assessment. For a full picture of what a typical Asia trip might cost — including hepatitis A, typhoid, rabies and malaria tablets — see our travel vaccine cost guide.

Mosquito bite prevention still matters

Even if you're vaccinated, avoiding bites is your first line of defence. Culex mosquitoes mostly bite from dusk through the night — the same hours that malaria-carrying mosquitoes are active — while dengue mosquitoes bite during the day. Good habits cover all three:

• Use a DEET-based repellent (30–50%) on exposed skin and reapply after swimming or sweating
• Wear long sleeves and trousers in the evening, ideally treated with permethrin
• Sleep under an insecticide-treated bed net if your room isn't screened or air-conditioned
• Take extra care in rural areas near rice paddies and farms

If your itinerary also carries a malaria risk, we'll talk through antimalarial tablets in the same consultation. For more pre-trip tips, see our post on 12 common travel health mistakes.

Where to get the Japanese encephalitis vaccine in Gloucester

You don't need to go through your GP — most GP surgeries don't offer the JE vaccine at all. At Brookfield Pharmacy, our travel clinic handles the full process:

1. Book a travel consultation online or by phone.
2. Consultation — we go through your destinations, dates, activities and medical history, and check the latest guidance for each country.
3. Recommendation — we'll tell you honestly whether the Japanese encephalitis vaccine is worthwhile for your trip, alongside anything else you need.
4. Vaccination — first dose on the day if you choose to go ahead, with your second dose booked in before you leave.

We're a short drive from Gloucester city centre and Brockworth, with parking nearby.

Frequently asked questions

How long before travel should I get the Japanese encephalitis vaccine?

Ideally start at least five to six weeks before departure so you can complete the standard two-dose course (28 days apart) with a week to spare. If you have less time, adults aged 18–65 can usually have the rapid schedule, with doses seven days apart.

Do I need the Japanese encephalitis vaccine for Thailand, Vietnam or Bali?

It depends on how and where you're travelling rather than the country alone. A short city-and-beach holiday usually doesn't need it. Longer stays, rural travel, rainy-season trips and time around rice paddies or farms are when we'd recommend it.

Is the Japanese encephalitis vaccine available on the NHS?

Not for travel. It's a private vaccine in the UK, which is why most GP practices don't stock it. At Brookfield Pharmacy it costs £100 per dose (£200 for the full course).

How long does the JE vaccine last?

After the two-dose primary course, adults who remain at risk are offered a booster 12–24 months later. After that booster, protection is expected to last for around ten years. We'll advise on boosters based on your future travel plans.

Can children have the Japanese encephalitis vaccine?

Yes — the vaccine can be given from two months of age, with a smaller dose for children under three. Children living in or travelling for long periods to rural endemic areas are among those who benefit most. Bring their Red Book to the consultation.

Book your Japanese encephalitis vaccination

Heading to rural Asia, planning monsoon-season travel, or not sure whether you need the JE vaccine at all? A short consultation will give you a clear answer. Book online here or call 01452 618377. Brookfield Pharmacy is at 5 Brookfield Road, Hucclecote, Gloucester GL3 3HA, open Monday to Friday 8:30–18:00 and Saturday 9:00–12:00.