YOU WALK TOWARD the arena, ready for a big game, tickets in hand. But what you see is a long line wrapping around the corner of the building and a bottleneck at the entrance as people search their pockets and purses for a small piece of paper. To be cleared to enter, you’ll also need that document—proof that you’ve received a COVID-19 vaccination.
This is the future as some experts see it: a world in which you’ll need to show you’ve been inoculated against the novel coronavirus to attend a sports game, get a manicure, go to work, or hop on a train.