Dr. Nicole McCullough, a global health and safety expert at

Dr. Nicole McCullough, a global health and safety expert at 3M, demonstrates the correct way to put on a N95 respiratory mask at a laboratory of 3M. The company has been contracted by the U.S. government to produce extra marks in response to the country’s novel coronavirus outbreak, in Maplewood, Minnesota, U.S. March 4, 2020. Picture taken March 4, 2020 REUTERS/Nicholas Pfosi

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