We hear it daily, a key piece of advice to slow the spread of coronavirus: Maintain six feet of social distance from other people. Public places like stores and banks have marked that distance on the floor to keep people standing in line safe. But just as it's become a way of life, some researchers say that distance may not always be enough to protect people against COVID-19.

In a new report, researchers from MIT and the University of Oxford say other factors—including ventilation, crowd size, duration of exposure, and whether face masks are used—should also be considered when setting social-distancing guidelines. 

"It's not just six feet and then everything else can be ignored, or just mask and everything else can be ignored, or just ventilation and everything else can be ignored," Lydia Bourouiba, an associate professor of civil and environmental engineering at MIT and co-author of the report, told NBC News. Read on to decide when you should get tested, and to keep yourself and others safe during this pandemic, don't miss this essential list of the Sure Signs You've Already Had Coronavirus.

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