The U.S. has begun a massive vaccination campaign to fight the coronavirus. But the effort will have plenty of challenges, including convincing people to get immunized. It’s not the first time the country has rolled out this kind of public health initiative. John Lauerman spoke with infectious-disease specialist William Schaffner of Vanderbilt University to learn more.

Learn more about your ad-choices at https://www.iheartpodcastnetwork.com