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In Italy, millions are locked down and more than 800 people have died from the coronavirus. In South Korea, hit by the disease at about the same time, only a few thousand are quarantined and 67 people have died. As the virus courses through the world, the story of two outbreaks illustrates a coming problem for countries now grappling with an explosion in cases.

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In addition to helping work out who to test, South Korea’s data-driven system helps hospitals manage their pipeline of cases. People found positive are placed in self-quarantine and monitored remotely through a smartphone app, or checked regularly in telephone calls, until a hospital bed becomes available. When a bed is available, an ambulance picks the person up and takes the patient to a hospital with air-sealed isolation rooms. All of this, including hospitalization, is free of charge.