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How, precisely, will we end the period of confinement that has stifled entire economies and left more than 1 billion people sheltering in place? Some have suggested a selective approach, whereby younger, less vulnerable cohorts would be ushered back to work before others. But dire warnings from epidemiologists about the inevitable health consequences have since eroded support for this strategy in most quarters.

Now, the only generally accepted solution is a gradual relaxation of restrictions, enabled by mass-scale testing, tracking and contact tracing to identify all those with whom an infected person has interacted. And, because it is not feasible to test 100 percent of the population, the ultimate solution lies in making track-and-trace systems work.

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