The full list for Thailand. Most people need the first two or three; the rest depend on where you are going and for how long.
Hepatitis AAlmost everyone
Spread through contaminated food and water. CDC recommends it for unvaccinated travellers aged one year and older, and notes that infants aged 6–11 months should also be vaccinated. The Government of Canada recommends it for all travellers to Thailand. Travellers over 40, immunocompromised, or with chronic medical conditions who are leaving in less than two weeks may be given immune globulin alongside the first dose.
TyphoidAlmost everyone
Also food and water. CDC recommends it for most travellers to Thailand, especially those staying with friends or relatives, or visiting smaller cities and rural areas. The Government of Canada describes it as low risk for most travellers, with the vaccine recommended for some. Available here as an injection or as oral capsules; the capsules are a course you finish over a week.
Routine vaccinesAlmost everyone
Chickenpox, diphtheria-tetanus-pertussis, influenza, measles-mumps-rubella, polio and shingles. CDC asks travellers to be up to date on all routine vaccines before every trip. There is a global measles notice: all international travellers should be fully vaccinated against measles at least two weeks before departure. Tetanus is the one that has usually lapsed — scooter grazes and coral cuts are how it comes up.
Hepatitis BUsually recommended
Spread through blood and bodily fluids. CDC recommends it for unvaccinated travellers younger than 60, and says those 60 and over may also be vaccinated. The Government of Canada notes the risk exists in every destination and recommends it for all travellers. Many Canadians already have it from the school programme, so we check first rather than assuming.
Japanese encephalitisDepends on your trip
A mosquito-borne virus, mostly rural and mostly seasonal. CDC recommends it for people moving to an endemic area, spending a month or more there, or travelling to endemic areas frequently; says to consider it for shorter stays involving rural areas, hiking, camping or unscreened lodging; and does not recommend it for short-term urban travel. The Government of Canada calls the risk very low for most travellers and higher for long-term or rural ones. Two doses 28 days apart, which is why it drives the timeline.
RabiesDepends on your trip
Present in Thailand. CDC recommends pre-exposure vaccination for selected travellers, considering whether they will be doing occupational or recreational activities that increase the chance of contact with a potentially rabid animal. The temple macaques and street dogs are the usual reason people ask. Being vaccinated beforehand does not remove the need to seek care after a bite — it changes what that care is, and buys time.
ChikungunyaDepends on your trip
CDC says the vaccine may be considered for people travelling or moving to Thailand who plan to stay for an extended period — for example six months or more. Not something a two-week trip needs.
CholeraDepends on your trip
Not recommended. CDC states there is no longer active cholera transmission in Thailand and the vaccine is not recommended. Included here because it is still sometimes suggested for Southeast Asia, and it should not be.
Yellow feverDepends on your trip
Not recommended for travel to Thailand itself. But proof of vaccination is required for entry if you are arriving from — or have transited an airport in — a country where yellow fever occurs. If your route touches Africa or South America, tell us: this is an entry requirement, not a health recommendation, and yellow fever is licensure-restricted, so we will tell you plainly whether we can give it or where to go.