Now that the Centers for Disease Control and Prevention is encouraging everyone to cover their mouth and nose with a protective cloth face mask, people are making their own, whether there no-sew, made with a simple bandanna or sewn on a machine. A study of homemade face masks by SmartAirFilters.com found that cotton T-shirts and cotton pillowcases are the best materials for making DIY face masks, based on their ability to capture particles yet remain breathable, and that they perform comparably to surgical-grade masks.
For the first time, the Center for Disease Control and Prevention (CDC) has recommended that even seemingly healthy people wear masks over their mouths and noses when venturing out of their homes into places where it is difficult to maintain distance from other people. But there is still major debate over how much masks particularly the homemade fabric masks that the CDC recommends for the public can slow the spread of SARS-CoV-2, the virus that causes COVID-19.Researchers, writing in two new papers, attempt to tackle the efficacy of masks, one more rigorously than the other, and come to differing conclusions. One study examined the effect of masks on seasonal corona viruses (which cause many cases of the common cold) and found that surgical masks are helpful at reducing how much virus a sick person spread. The other looked particularly at SARS-CoV-2 and found no effect of either surgical or fabric masks on reducing virus spread, but only had four participants and used a crude measure of viral spread.
Face mask basics
Recommendations about masks can easily get confusing, because all masks are not made equal. The N95 mask effectively prevents viral spread. These masks, when properly fitted, seal closely to the face and filter out 95% of particles 0.3 microns or larger. But N95 masks are in serious shortage even for medical professionals, who are exposed to the highest levels of SARS-CoV-2 and are most in need of the strongest protection against the virus. They’re also difficult to fit correctly. For those reasons, the CDC does not recommend them for general use.
Due to shortages, the CDC also does not recommend surgical masks for the general public. These masks don’t seal against the face but do include non-woven polypropylene layers that are moisture resistant. In a surgical mask, about 70% of the outside air moves through the mask and about 30% travels around the sides, Chu told Live Science. For that reason, they don’t offer as much protection as N95s.
But what about the other way around? When the wearer of a mask coughs or sneezes, the barrier might be enough to contain a lot of that initial jet of grossness an even if there are gaps in the fabric or around the sides. That’s what the new mask studies aimed to address: Whether surgical or fabric masks did a good job of containing viruses.