Can You Get Reinfected?

The Brazil variant raises a scary question — and reminds us that herd immunity needs to cross borders. Also: Katherine shares the first episode of The Experiment, a new show from The Atlantic and WNYC Studios.  Subscribe to The Experiment here: Apple Podcasts / Google Podcasts / Spotify / Stitcher / Pocket Casts Learn more about your ad choices. Visit megaphone.fm/adchoices