Seoul – In May, when a coronavirus outbreak hit nightclubs in the South Korean capital of Seoul, health officials quickly unleashed their version of the Navy Seals — elite teams of epidemiologists, database specialists and laboratory technicians.
An old-school, shoe-leather investigation showed the virus had jumped from a night-club visitor to a student, to a taxi driver and then alarmingly to a warehouse employee who worked with 4,000 others.
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