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Do I Need a Japanese Encephalitis Vaccine for Thailand, Vietnam or Bali?

If you are planning a trip to Southeast Asia, you may be wondering whether you need a Japanese encephalitis vaccine before you travel. The answer depends on where you are going, how long you will be there, and what you plan to do. At Brixton Travel Clinic in London, our clinicians help travellers assess their risk and receive the right vaccinations before departure.If you are unsure whether this vaccine is right for your trip, book an appointment with us today or simply drop in to one of our London branches.

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Japanese encephalitis is a viral brain infection spread by mosquito bites. Most people who are infected do not develop symptoms, but a small number become seriously ill. Vaccination is the most effective way to prevent infection.

What Is Japanese Encephalitis?

Japanese encephalitis (JE) is caused by a virus transmitted through the bite of infected Culex mosquitoes. These mosquitoes typically breed in rice paddies and areas near livestock, particularly pigs and wading birds.

  • Spread by mosquito bites, not person to person
  • More common in rural and agricultural areas
  • Risk increases during and after monsoon season
  • Serious cases can cause encephalitis (brain inflammation)
  • There is no specific antiviral treatment once infected
  • Vaccination provides effective long-term protection

Bali travel destination beach holiday

Risk by Destination: Thailand, Vietnam, and Bali

Risk varies depending on your specific destination, travel style, and time of year. The table below summarises general risk levels and relevant travel considerations.

Destination General Risk Level Higher Risk Scenarios Vaccine Recommended?
Thailand Low to moderate Rural areas, northern regions, stays over 4 weeks Yes, for higher risk travellers
Vietnam Moderate Rural, agricultural regions, northern Vietnam, extended stays Yes, particularly for rural travel
Bali (Indonesia) Low to moderate Central and northern Bali, rice paddies, remote stays Considered for longer or rural trips

Short-stay tourists visiting cities and beach resorts typically face a lower risk than those travelling to rural or agricultural areas.

Who Should Consider the Japanese Encephalitis Vaccine?

The vaccine is generally recommended for travellers who:

  • Plan to spend a month or more in affected regions
  • Will be visiting rural or agricultural areas
  • Are volunteering, working, or undertaking outdoor activities
  • Are travelling during monsoon season when mosquito activity is higher
  • Have a high exposure risk even on shorter trips

A travel health consultation at our Brixton clinic allows us to review your itinerary and provide personalised recommendations.

Hints and Tips for Travellers

+ When should I start the vaccine course?
The standard JE vaccine (Ixiaro) involves two doses given 28 days apart. Ideally, start at least 6 weeks before travel to allow both doses to be completed. An accelerated schedule giving both doses 7 days apart may be available for those with less preparation time. Speak to our team at Brixton Travel Clinic for guidance.
+ Does the vaccine protect for life?
Protection from the primary two-dose course typically lasts several years. A booster dose is recommended if you travel again to an at-risk area more than 12 to 24 months after your first course. Your clinician will advise on timing based on your travel history.
+ Should I still use mosquito repellent if vaccinated?
Yes. The vaccine reduces your risk of Japanese encephalitis, but mosquitoes can transmit other infections including dengue and malaria. Always use a DEET-based repellent, wear long sleeves after sunset, and use mosquito nets when sleeping in rural areas.

Mosquito bites can cause JE

Frequently Asked Questions

+ Is Japanese encephalitis common in tourists?
Serious illness in short-term tourists is rare, but the risk increases with rural travel, longer stays, and outdoor activities. Because there is no treatment once infected, prevention through vaccination is important for those at higher risk.
+ Is the Japanese encephalitis vaccine safe?
Yes. The Ixiaro vaccine is widely used and considered safe for most adults and children over two months of age. Common side effects include mild soreness at the injection site, headache, or fatigue. Your clinician will discuss your medical history before administering the vaccine.
+ Can I get the vaccine if I am travelling next week?
An accelerated schedule may be possible depending on how soon you travel. Contact us as soon as possible so our team can advise on the most appropriate option for your timeline.
+ Do I need other vaccines for Thailand, Vietnam, or Bali?
Yes, other vaccines may also be recommended, including hepatitis A, typhoid, and tetanus. Your travel consultation at our London clinic will cover all relevant vaccinations based on your destination and health history.

Get Expert Advice at Brixton Travel Clinic, London

Whether you are heading to the temples of northern Vietnam, the rice terraces of Bali, or the rural landscapes of Thailand, a travel health consultation helps ensure you are properly protected. Our clinicians at Brixton Travel Clinic will review your itinerary, assess your personal risk, and recommend the most suitable vaccines and health precautions.

To discuss the Japanese encephalitis vaccine or any other travel vaccinations, contact us on 020 7733 4075, drop in to our Brixton or London branches, or book your appointment today.

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☑ Clinically Reviewed by Pharmacy Mentor
A pharmacist reviews the content to help ensure medicines are presented responsibly and that patient-facing health information is accurate, appropriate, and aligned with current clinical guidance.
Last reviewed: May 2026
Written on behalf of Brixton Travel Clinic by Pharmacy Mentor.

The information provided in this blog is intended for educational purposes and should not replace personalised advice from one of our qualified healthcare professionals.