You've been vaccinated. So what should you do with your vaccine card?

More than 100 million Americans have received at least one COVID-19 vaccine shot. The proof? A 4-by-3-inch paper "vaccination record card" issued by the U.S. Centers for Disease Control and Prevention. 

In a post-pandemic world, however, that humble card for those who are fully vaccinated could become an important document used for travel, attending events, returning to the post-pandemic office and other purposes. Here's what experts say you should know about vaccination cards.