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Correspondence to Mr Prateek Bahl, School of Mechanical and Manufacturing Engineering, UNSW, Sydney, NSW 2052, Australia;prateek bahl@protonmail com ;Professor C Raina MacIntyre, Biosecurity Program, The Kirby Institute, UNSW, Sydney, NSW 2052, Australia;rainam@protonmail com To evaluate the effectiveness of the Centers for Disease Control and Prevention (CDC) recommended one- and two-layer cloth face covering against a three-ply surgical mask, we challenged the cloth covering against speaking, coughing and sneezing The one-layer covering was made using ‘quick cut T-shirt face covering (no-sew method)’ and the two-layer covering was prepared using the sew method prescribed by CDC 1 To provide visual evidence of the efficacy of face coverings we used a tailored LED lighting system (GS Vitec MultiLED PT) along with a high-speed camera (nac MEMRECAM HX-7s) to capture the light scattered by droplets and aerosols expelled during speaking, coughing and sneezing while wearing different types of masks (figure 1 and online supplementary video) Data availability statement All data relevant to the study are included in the article or uploaded as supplementary information References 1 Centers for Disease Control and Prevention (CDC)
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