Advanced Sciences journal. "Like the common sense of just putting your hand in front of your face, we really thought that any mask would be better than nothing," he explained.
Unsurprisingly, the most effective are the medical-grade coverings - N-95 masks then surgical masks. Cloth masks come in third, followed by a makeshift scarf or bandana mask.
Dr Westman is an internal medicine specialist, who is not dealing with cases of Coronavirus. But he felt that he could still make an impact on stopping the spread.
Early on in the pandemic, he knew that masks were cricial to prevention and investigated how he could distribute masks to vulnerable people.
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