This story is older. It played out a few years ago, apparently. But in light of current attention on vaccine safety it might be worth knowing about.
https://icandecide.org/article/ican-v-fda-chicken-pox-vaccine-should-never-have-been-licensed/
Judging by ingredient lists of the various chicken pox vaccine products it seems a child getting one of the vaccines is likely exposed to human and non-human DNA.