Although cloth masks have been widely adopted, many people still have questions about them. (Usplash/Vera Davidova) Catherine Clase, McMaster University; Edouard Fu, Leiden University, and Juan Jesus Carrero, Karolinska Institute Face masks reduce the spread of viruses passed on from respiratory secretions. While cloth masks are imperfect, widespread use of an imperfect mask has the potential to make a big …
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