"Even a single-layer face covering is better than no face covering. "These visualisations show the value of using face masks and the difference between types of masks." The researchers said other factors contribute to the effectiveness of cloth face masks, such as design and fit, as well as the frequency of washing. But they added: "In case of shortages of surgical masks, a cloth face covering with at least two layers is preferable to a single-layer one. "Guidelines on home-made cloth masks should stipulate multiple layers."

Source: Daily Mirror July 23, 2020 22:30 UTC