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Jade Flinn, on the right, a critical care nurse at The Johns Hopkins Hospital in Baltimore, works with COVID-19 patients in what she says looks like a “moon suit.” Rick Lucas, on the left, a critical care nurse at The Ohio State University Wexner Medical Center, was instructed to wear the same surgical mask all day for all but the highest-risk procedures. (CREDIT: Courtesy of Rick Lucas and Jade Flinn)