My parents got the Japanese Encephalitis vaccine prior to an extensive Asia vacation a few years ago.
I was supposed to get it when on active duty (prior to a deployment) but the Air Force did not stock it, and the local university hospital (travel medicine department) would not take Tricare, so it was going to be a billing nightmare.
I did not get it in the end. I remember it was relatively expensive.
If you travel around Asia a lot I would get it, especially if you can get the company to pay for it. It is a nasty disease.