What Happened Today: U.S. GDP Shrank, Contact Tracing Questions Public officials across the U.S. are considering using contact tracing to ensure a safe reopening of the states. NPR's health policy correspondent answers listener questions on contact tracing.

What Happened Today: U.S. GDP Shrank, Contact Tracing Questions

What Happened Today: U.S. GDP Shrank, Contact Tracing Questions

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Public officials across the U.S. are considering using contact tracing to ensure a safe reopening of the states. NPR's health policy correspondent answers listener questions on contact tracing.