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"SARS-CoV-2, influenza, RSV, and other respiratory viruses can cause mild and asymptomatic infections, so staff or visitors might not realize they are infected, yet asymptomatic and presymptomatic people can still be contagious and spread infections to patients. Furthermore, despite repeated requests by health care system leaders for symptomatic staff to stay home, “presenteeism” (coming to work despite feeling sick) remains common. Even during the height of the pandemic, some health care systems reported that 50% of staff diagnosed with SARS-CoV-2 worked while symptomatic. Studies from both before and during the pandemic suggest that masking among health care workers can reduce nosocomial respiratory viral infections by approximately 60%"
