Abbott Laboratories said Thursday that it would change the instructions for using its fast coronavirus test for a second time, days after a preliminary study by a major medical center found the device frequently gave negative results for patients who were infected with the virus.

The change will tell users that negative results produced by Abbott’s ID Now device are “presumptive” and should be verified with an alternative test for patients with signs of the virus. That means sacrificing the device’s quick turnaround time…

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