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Vaccines and drugs get much of the attention in the scientific race to fight COVID-19. But companies have been working just as hard on ways to meet the enormous demand for testing. Those investments are beginning to pay off.

Abbott Laboratories Inc. and ThermoFisher Scientific Inc., two major players in coronavirus testing, reported third-quarter results Wednesday that beat Wall Street estimates thanks largely to this focus. They followed Roche Holding AG, another leader in testing whose earnings last week showed a similar windfall. All three companies reported impressive growth as they ramped up machine production and rolled out new types of tests.

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