I do not think you need to worry about yellow-fever vaccination unless you are transiting an affected part of Africa on the way there. The only yellow fever in Asia is a handful of people in China who acquired it last year from Angola.

But you probably want to consider antimalaria pills unless you are staying urban, as others have said. They are expensive in the USA but I have gotten by with cheap doxycycline purchased in India and Thailand (as well as basic mosquito avoidance), taken daily from two days before travel to a month after. Of course, please do your own research as I am not a health specialist.

Seth