The rapid change to the latest versions of Pfizer Inc./BioNTech SE’s Comirnaty and Moderna, Inc.’s Spikevax vaccines against SARS-CoV-2 illustrates the likelihood that they will maintain their leading market positions for vaccines to prevent COVID-19, given the “plug-and-play” properties of messenger RNA vaccines that allow much more rapid development than their traditional counterparts.
The US Food and Drug Administration said 22 August that it had approved and granted emergency use authorization (EUA) to...








