What is an mRNA Vaccine?

mRNA vaccines have recently been in the news as an exciting potential preventative of SARS-CoV2.  The technology seems new, but has roots in the 1990’s and a long history of maturation, plagued by technical barriers and skepticism.  However, the efficacy demonstrated in clinical trials is promising, and suggests that mRNA-based strategies may have a prominent role as vaccines and therapeutics against some of our most insidious diseases.