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Amira Roess, professor in the Department of Global and Community, offers insight into practicing proper mask usage, such as identifying which masks are most effective in reducing the spread of COVID-19 and how long you should wear the masks before they are considered ineffective. 

Amira Roess, professor of global health and epidemiology at Mason’s College of Health and Human Services, and Angela Chezem, MD, medical director, COVID Surveillance Program (Safety, Emergency, and Enterprise Risk Management), offer advice to the Mason community on omicron variant safety over the winter holiday season.