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Explainer: What is contact tracing and how can it help fight the new coronavirus?

Contact tracing has been used for decades to control the spread of infectious diseases. The basic idea is simple: track down infected people, then find everyone who has been near them and encourage those people to stay home until it is clear they are not sick.

Right now, stay-at-home orders are being used worldwide to minimize the potential for people infected with the novel coronavirus to spread it. When restrictions are lifted and normal activities resume, extensive contact tracing will be needed to prevent new outbreaks.

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