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Face coverings and mask to minimise droplet dispersion and aerosolisation: a video case study
  1. Prateek Bahl1,
  2. Shovon Bhattacharjee2,
  3. Charitha de Silva1,
  4. Abrar Ahmad Chughtai3,
  5. Con Doolan1,
  6. C Raina MacIntyre2
  1. 1 School of Mechanical and Manufacturing Engineering, UNSW, Sydney, NSW, Australia
  2. 2 Biosecurity Program, Kirby Institute, UNSW, Sydney, NSW, Australia
  3. 3 School of Public Health and Community Medicine, UNSW, Sydney, NSW, Australia
  1. Correspondence to Mr Prateek Bahl, School of Mechanical and Manufacturing Engineering, UNSW, Sydney, NSW 2052, Australia; prateek.bahl{at}protonmail.com; Professor C Raina MacIntyre, Biosecurity Program, The Kirby Institute, UNSW, Sydney, NSW 2052, Australia; rainam{at}protonmail.com

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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). The video for speaking was captured at …

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