The mRNA vaccine is not a vaccine but is referred as such for the sake of avoiding all the technical speak. While a virus may not be considered a living organism, it replicates in a host, thus acting as if it were alive. I guess I could have said, "A virus mimics the actions of "living" by replicating itself inside of a host in a similar way that a parasite does inside said host." Better?

All that to say, it doesn't change my response to the OP's question.