They were tested to the same standards. The difference was instead of doing thing serially, things were done in parallel which reduced the time required. Simply good product management.
PeterPrinciple wrote: “No, the time factor is VERY MUCH an important part of testing. This was a shortcut.”
For COVID Vaccines, Speed Didn’t Mean Shortcuts
How did they get developed so quickly without cutting corners? There are three big reasons to trust the science of these new vaccines.