Companies from Amazon.com Inc. to General Motors Co. are exploring ways to test their employees for Covid-19 before they come in to work.

Regular tests for workers could keep exposure to sick employees to a minimum and boost employees’ confidence about coming back to work, corporate medical advisers and human-resources executives say. Yet companies face hurdles in rapidly building testing capacity. For one, tests remain tough to obtain in large quantities, those people say, and the practice raises potential issues of privacy…

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