When a coronavirus vaccine is ready, who gets it first?

Government and private companies around the world have mobilized in an effort to develop a vaccine for the coronavirus at a record pace. The Trump administration earlier this month announced a program called Operation Warp Speed in hopes of having a viable vaccine ready by the end of the year.

Creating a vaccine in a year or 18 months would be an unprecedented achievement. But some experts say the steps afterward are where the hard work really starts. Getting billions of vaccine doses to people in the far corners of...