When it comes to homemade face masks, two or three layers of fabric is best, researchers say.
And the double-layer mask was better than a single-layer mask, the researchers said in a journal news release.
Effectiveness may also depend on other factors, including the material used, design and fit, and how often the mask is washed, according to C. Raina MacIntyre, of the Biosecurity Research Program at the Kirby Institute at University of New South Wales, and colleagues. "Guidelines on home-made cloth masks should stipulate multiple layers," the researchers concluded."There is a need for more evidence to inform safer cloth mask design, and countries should ensure adequate manufacturing or procurement of surgical masks."
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