Researchers tested 14 commonly worn masks to see which are most effective. Both neck fleeces and bandanas proved ineffective.
is shedding light on which masks are most effective — and which may actually be hurting the effort to curb COVID-19.
The most secure mask, an N95, led to a droplet transmission of below 0.1 percent. But handmade cotton and polypropylene masks, some of which were made from apron material, also proved effective, with droplet transmission ranging from 0.1 percent to 0.4 percent. One mask, which was knitted, released a higher number of droplets, from 0.1 percent to 0.6 percent. But none of the masks compared with the neck fleece, which had 110 percent droplet transmission .
The researchers explain how these masks may actually spread more of the virus than not wearing one at all. “We noticed that speaking through some masks seemed to disperse the largest droplets into a multitude of smaller droplets ... which explains the apparent increase in droplet count relative to no mask in that case,” they write. These small droplets could prove extremely dangerous in terms of transmission.
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