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Are two cloth masks better than one for preventing the spread of COVID-19?

By Catherine Clase, Physician, epidemiologist, associate professor, McMaster University
Charles-Francois de Lannoy, Assistant Professor, Chemical Engineering, McMaster University
Juan Jesus Carrero, Professor of Epidemiology, Karolinska Institutet
Roberto Pecoits-Filho, Professor of Medicine, Pontificia Universidade Católica do Paraná
Scott Laengert, PhD Student, Chemical Engineering, McMaster University
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Are two face masks better than one? Adding layers of filtration by double masking is a way of using the masks that we already have, possibly to better effect.

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