Contact Tracing Is Key To Reopening. We're Not There Yet
b'The U.S. may need 100,000 people trained in the public health practice of contact tracing \\u2014 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.
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