Yes, masks reduce the risk of spreading COVID, despite a review saying they don't

By C Raina MacIntyre, Professor of Global Biosecurity, NHMRC Principal Research Fellow, Head, Biosecurity Program, Kirby Institute, UNSW Sydney
Abrar Ahmad Chughtai, Senior lecturer, UNSW Sydney
David Fisman, Professor in the Division of Epidemiology, University of Toronto
Trish Greenhalgh, Professor of Primary Care Health Sciences, University of Oxford

An updated Cochrane Review suggests face masks don’t reduce the spread of COVID in the community. But there are several reasons why this conclusion is misleading.

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