Tracing Coronavirus Social Contacts: We Need an App for That

Americans are eager to return to work and resume normal life. But public-health officials are warning that Covid-19 cases will increase sharply once social-distancing measures are relaxed. How can policy makers get the economy moving again without a second spike of infections? Part of the answer is relying on technology to help slow the spread.

The key to containing any epidemic is identifying individuals who are infected, isolating them, and tracking down their contacts, who should also quarantine themselves for a period…

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