The Coronavirus Vaccines Were Developed in Record Speed. Now, the Hard Part.

The Food and Drug Administration is expected to grant emergency use authorizations to the first two coronavirus vaccines in the next several days. The sheer speed with which doctors and scientists were able to reach this stage is a major achievement, and the early results for both vaccines are undeniably impressive. New vaccines normally take years to develop, and scientists initially worried.

But when all is said and done, making the vaccine might turn out to have been the easy part.