DNA viruses include, among others, the herpes viruses that cause genital herpes, chickenpox and other infections. The first thing we need to understand is that viruses comes in different classes.
Meanwhile, here is a rundown of the history of mRNA vaccine technology. We have received numerous requests to document the history of mRNA vaccine technology, and we're working on a dedicated article to be hosted on the main History of Vaccines site along with edits to the already there.