DETROIT – Researchers are learning more about what makes a cloth mask more effective against the spread of coronavirus (COVID-19).
A new study in the medical journal, Thorax, indicates that layers are essential and that having at least two is better than one layer.
Researchers in Australia tested the effectiveness of the CDC recommended one or two layer cloth mask coverings and a three-ply surgical mask.
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Their videos captured the droplets and aerosols projected while counting to ten. Then, while coughing and sneezing. While the single layer was better than no mask.
Adding a second layer was significantly better at reducing the spread of droplets. Based on their tests, the researchers said homemade masks should contain multiple layers. They recommend at least three layers.
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Studies also found that a tighter fitting mask allowed fewer droplets to escape, while also reducing the need to touch or adjust the mask. Experts also stress that it’s critical to make sure the mask covers your mouth and nose.
Another way to improve a cloth mask is to select one with a pocket that can hold a filter. Sliding in a coffee filter or even additional layers of fabric can increase the effectiveness.