Japanese encephalitis around Chiang Mai: where the risk sits in northern Thailand, who should be vaccinated, the schedule and cost. Same-day appointments at our two Chislehurst pharmacies.
Chiang Mai is a favourite for travellers heading into northern Thailand, and it sits in one of the country’s more relevant areas for Japanese encephalitis. The risk is not in the temples and cafés of the old city so much as in the farmland and rice-growing countryside that surrounds it. This page looks at that risk and who should consider the vaccine. For the schedule, doses and safety, our complete guide to the Japanese encephalitis vaccine has the detail.
Japanese encephalitis is spread by Culex mosquitoes that breed in flooded rice paddies and around pig farming. Northern Thailand has plenty of both, and the valleys and farmland around Chiang Mai are classic territory for the virus during the wet season. That is why the area features in travel health advice more than the southern beaches do. Chiang Mai is also a base for the kind of trips that raise exposure: trekking, hill-tribe visits, cycling, and longer rural stays.
It helps to separate the city from the countryside. A few days exploring the old city, its markets and temples carries low risk. Spending weeks in the region, staying out in the valleys, or heading off on rural excursions during the monsoon is a different proposition. Chiang Mai usually forms part of a wider Thailand trip, so it is worth reading this alongside our guidance on whether you need the Japanese encephalitis vaccine for Thailand as a whole.
If your Chiang Mai plans involve a month or more in the region, significant time in the rural valleys, trekking or cycling through farmland, or travel during the wet season, the vaccine is worth having. For a short, city-based visit with no rural excursions, most travellers do not need it. As ever, the sensible step is a quick risk assessment based on your actual plans rather than a blanket yes or no.
The vaccine is a two-dose course of Ixiaro, the only Japanese encephalitis vaccine licensed in the UK. Doses are 28 days apart on the standard schedule, with protection beginning seven days after the second dose. Adults aged 18 to 65 can use an accelerated schedule of two doses seven days apart. We recommend booking four to five weeks before travel where possible. You can find the finer points in our full Japanese encephalitis vaccine guide.
The Japanese encephalitis vaccine is £125 per dose at Chislehurst Pharmacy Group, which is £250 for the full course. Northern Thailand trips often need other cover too, such as hepatitis A, typhoid and malaria prevention for certain rural areas, and we can assess all of it in one appointment. We confirm what you need before anything is given, so you only pay for the protection your trip calls for.
Even with the vaccine, avoiding bites is worthwhile, and it protects against other mosquito-borne illnesses in the region as well. Culex mosquitoes are most active at dusk and dawn, so cover up at those times, use an effective insect repellent, and sleep under a net where rooms are not screened. If you are staying out in the valleys or trekking, these habits matter more, not less.
Yes, in the rural farmland and rice-growing countryside around the city, especially in the wet season. The city centre itself carries lower risk than the surrounding countryside.
Often not. A few days in the old city carries low risk. The vaccine becomes more relevant for longer stays, rural excursions, trekking or hill-tribe visits during the transmission season.
During the wet season, roughly May to October, when flooded rice fields increase mosquito numbers in the countryside around Chiang Mai.
Ideally four to five weeks before travel. Adults aged 18 to 65 can use the seven-day accelerated schedule if time is short. Protection begins seven days after the second dose.
£125 per dose, which is £250 for the full two-dose course at Chislehurst Pharmacy Group.
Yes. We assess and provide other recommended vaccines and malaria tablets in the same appointment, so everything is handled in one visit.
If your route runs through the north, a short consultation will give you a clear answer. Read the background in our detailed Japanese encephalitis vaccine information, then book in and we will tailor it to your trip.
Ready to take the next step?
Book your consultation at either Chislehurst Pharmacy Group location. Same-day and next-day appointments usually available.
