2020/12/31 · on december 18, 2020, the food and drug administration (fda) issued an emergency use authorization (eua) for the moderna covid-19 (mrna-1273) vaccine (modernatx, inc; cambridge, massachusetts), a lipid nanoparticle-encapsulated, nucleoside-modified mrna vaccine encoding the stabilized prefusion spike glycoprotein of sars-cov-2, the virus that