Disclaimer: I am not a medical professional (though I have seen almost every episode of ER, and I almost always win at ‘Operation’). My opinions come from my own travel experience, talking to other travelers and expats, and asking the locals. I’m not qualified to be giving medical advice, but I will give you a realistic, unbiased overview of vaccines and antibiotics without any hidden agenda. Take it or leave it, here’s my advice on what vaccines you need for traveling throughout Southeast Asia.
You’ll probably read all about vaccines, anti-malaria pills, and rabies shots for travel in South East Asia, and you’ll probably hear from your doctor that you should be fully inoculated before you leave for your travels. More than likely, you’ll have to go to a special travel clinic to get your shots and antibiotics, and you’ll have to pay a pretty penny. On average, it seems like the general fee for getting the basic recommended vaccines (not counting all of the fancy ones!) is around $1,000 US that you pay out of pocket (I’m not sure if some countries subsidize this cost via national health plans).
I would argue that many travel clinics scare you into getting shots you don’t really need, just so they can bill you for them. They present the dangers as being more imminent than they really are (just because you technically can get Japanese encephalitis in Cambodia, doesn’t mean that you will!).