Healthcare Moderna completes enrollment of phase 2 study of its mRNA COVID-19 vaccine Updated : July 09, 2020 12:55 AM IST mRNA-1273 is Moderna’s second mRNA vaccine for an infectious disease to complete enrollment of a Phase 2 study, following the company’s CMV Phase 2 study, which was fully enrolled on March 3, 2020. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.