I would visit a travel clinic and they can advise you of the best vaccinations to get. Many hospitals (at least in the US)
have a clinic dedicated for travel medicine.
Here's a list I found on the CDC web site.
Measles/mumps/rubella (MMR) vaccine (unless HIV+)
Pneumoccol (esp if HIV+)
Meningoccol (recommended, esp if living in close quarters with others, eg dormitory, barracks.)
Hep A and B (every one should have these)
Tetnus-diptheria
Typhus (there are two vaccines: one live attenuated virus, the other killed virus. The live one is better but if you
are HIV+, not recommended.)
Polio Boost
Rabies but only if you expect to travel to very rural parts of SE Asia.
Maleria. Would not bother unless you plan to travel to more remote parts. there is little maleria risk in the major cities and tourist areas of Thailand.
I would also ask you doc for a script for a medication called XiFaxin for traveler's diarreha and one for Cipro (tho you can buy Cipro easily enough in Thailand.)
You can get more advice and information off the US CDC site at:
http://wwwn.cdc.gov/travel/destinationList.aspxSimilar Threads: