Smartphone App Sends Alert If You’ve Been Exposed to COVID-19

Communities in the United States and around the world are talking about when and how to ease lockdown measures as they grapple with the COVID-19 pandemic. This disease and how it spreads presents some unique challenges. People without symptoms can infect others, and for some, it can be deadly. What if a smartphone app could let you know if you have been exposed? Michelle Quinn reports.
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