Mae’r broses o ddatblygu brechlynnau’r coronafeirws wedi bod mor llym â’r broses ar gyfer unrhyw frechlyn arall ond yn sgil y pandemig mae wedi’i chyflymu drwy gyllid prydlon, byd-eang a llai o waith papur. Nid yw hyd y treialon wedi’i leihau, ac mae’r mesurau diogelwch arferol yn dal i fod ar waith.
The development process for coronavirus vaccines has been as stringent as any other but the process in the face of the pandemic has been sped up by prompt, world-wide funding and a reduction in paperwork. The length of the trials have not been shortened, and the usual safety measures remain in place.