As Nations Reopen, Warning Emerges About Coronavirus Contact Tracing Voids© gadgets.ndtv.com

As Nations Reopen, Warning Emerges About Coronavirus Contact Tracing Voids

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A top world health official Monday warned that countries are essentially driving blind in reopening their economies without setting up strong contact tracing to beat back flare-ups of the coronavirus.

The warning came as France and Belgium emerged from lockdowns, the Netherlands sent children back to school, and many US states pressed ahead by lifting business restrictions. Tesla CEO Elon Musk announced the company's 10,000-worker electric car factory near San Francisco was operating Monday in defiance of coronavirus health orders that closed nonessential businesses.

Authorities have cautioned that the scourge could come back with a vengeance without widespread testing and tracing of infected people's contacts with others.