Plexiglass barriers at businesses have become ubiquitous during the coronavirus pandemic.

The barriers, though, may provide a false sense of security.

"We know that, of course, the virus itself can be in much smaller particles. It can go around the plexiglass," said Dr. Wafaa El-Sadr, a professor of epidemiology and medicine at Columbia University

Experts recommend that plexiglass barriers be used in conjunction with social distancing, masks and handwashing.

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