Contact Tracing, the West’s Big Hope for Suppressing Covid-19, Is in Disarray

PARIS—When countries across the West emerged from lockdown in the spring, governments trained legions of investigators to identify and isolate people potentially infected with the coronavirus. The goal was to prevent a resurgence of the pathogen.

Four months later, the systems to find people who might pass on infections, known as contact tracing, are in disarray. Europe and the U.S. are each recording tens of thousands of new daily infections.

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