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How contact tracing is being used in America's fight against coronavirus

In order to stop the rapid spread of COVID-19, public health officials say the nation will need an "army" of contact tracers who can identify those with the disease and people they've had close contact with. Tony Dokoupil interviews Massachusetts Governor Charlie Baker about his state's efforts in snuffing out the virus and gets a demonstration from a volunteer contact tracer in New Haven, Connecticut.
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