National Health & Safety Experts say more testing is urgently needed to spot and track the variant in the U.S. 4:51pm November 29, 2021 by Rob Stein Health National Share URL copied to clipboard! Play Pause There was an error loading the media player. Copyright 2021 NPR. To see more, visit https://www.npr.org. 300x250 Ad More All Things Considered National 78th Tony Awards preview: What to expect on Broadway's biggest night by Scott Detrow Arts How to manage the flurry of text messages on any given day? Texting etiquette explained. 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate