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PARIS—When international locations throughout the West emerged from lockdown in the spring, governments skilled legions of investigators to establish and isolate individuals probably contaminated with the coronavirus. The aim was to stop a resurgence of the pathogen.
Four months later, the techniques to seek out individuals who would possibly cross on infections, often called contact tracing, are in disarray. Europe and the U.S. are every recording tens of 1000’s of latest day by day infections.
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