Hi, !
I can't offer more insight than Richard already did. I have a sister who travels extensively and from her experiences, I can say that certain areas of Asia are less of a risk than others when it comes to various viruses and diseases. So, depending on where exactly you are going (and when), that could factor in to whether you want to risk going without vaccinations. It honestly does depend on a few factors; like your overall health, access to quality medical facilities while traveling, etc.
Best, Erin, Team Member.