Japanese Encephalitis Vaccine

What is Japanese Encephalitis?

Japanese Encephalitis is a viral infection spread by mosquito bites, mainly in parts of Asia and the Western Pacific. Most infections are mild, but in rare cases it can cause serious inflammation of the brain, leading to neurological complications and potentially death.

Who should get the Japanese Encephalitis vaccine?

The vaccine is recommended for travellers spending extended time in rural areas of countries where Japanese Encephalitis is present, particularly during the rainy season. It may also be advised for those visiting for long periods, working outdoors, or travelling to areas with rice fields or pig farming.

How effective is the Japanese Encephalitis vaccine?

The Japanese Encephalitis vaccine provides strong protection when the full course is completed. It significantly reduces the risk of developing severe illness from the virus.

How many doses are required?

The course needs to be completed at least 10-14 days before you leave in case of an allergic reaction. The vaccine requires two doses, with the second dose given 28 days after the first. The vaccine will require a booster between 12 months and 24 months later. This will provide a further 12 months cover This vaccine is only licensed for people aged over 18 and not recommended for children. There is no data on the duration of protection a course provides.

Are there any side effects of the vaccine?

Mild side effects may include soreness at the injection site, headache, muscle aches, or mild fever. Serious reactions are rare and will be discussed during your appointment.

How long before travel should I get the vaccine?

The course should ideally be started at least 5 to 6 weeks before travel to allow time to complete both doses. If you are travelling sooner, speak to us as early as possible as an accelerated schedule may be suitable.

Do I still need mosquito bite prevention after vaccination?

Yes. As no vaccine provides 100% protection, travellers should still use insect repellent, wear long clothing, and sleep under mosquito nets where appropriate to reduce the risk of mosquito-borne illness.