There are a lot of anti-vax people on both the left and the right, but they have very different paths for getting there. The ones on the left are suspicious because of big corporations making the vaccines, and a general suspicion of anything that is synthetic. The ones on the right on the other hand don’t believe in the authority of science, so you get links there between anti-vaccine advocates, young-earth-creationists, global warming hoaxers, etc. So the left is anti-technology, while the right is anti-science.