Linsey Marr, a civil and environmental engineering professor at Virginia Tech, a doubled-up gaiter blocked more than 90 percent of the particle sizes tested.and tested the coverings using an enhanced version of the method developed by the Duke scientists. They found that gaiters with multiple layers performed better than standard two-layer cloth masks tested, providing a 96 percent average reduction in respiratory droplets compared with wearing no covering at all.
It is not also yet known “what level of protection a face shield provides to people nearby from the spray of respiratory droplets from the wearer,” the CDC says, adding that it does not recommend the plastic barrier as a substitute for masks. “I actually do not recommend people run around with both,” she says. “I’m very comfortable with the powerful effect of the facial mask. But if you are doing a close procedure or if you are very high-risk and really just want to minimize any questions, you can wear face shield.”There are simple tests you can do to evaluate a face covering, Poland and Ernst say.
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