The U.S. may need 100,000 people trained in the public health practice of contact tracing — tracking and isolating people who've been in contact with someone who tests positive for the coronavirus. NPR health policy reporter Selena Simmons-Duffin) explains how it works, and why it's a key part of the fight against the pandemic. Email the show at [email protected]).Learn more about sponsor message choices: podcastchoices.com/adchoices)NPR Privacy Policy)
