Further research on better cloth masks will be helpful. At the Centre of Excellence for Protective Equipment and Materials at McMaster, we hope to play a role in that work. However, even imperfect uptake and imperfect use of imperfect masks has the potential to have a surprisingly large impact during this pandemic. We should not let the perfect be the enemy of the good.

Catherine Clase, Physician, epidemiologist, associate professor, McMaster University; Edouard Fu, MD/PhD Candidate in Clinical Epidemiology, Leiden University, and Juan Jesus Carrero, Professor of Epidemiology, Karolinska Institute

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