Masks work, our comprehensive review has found

By Trish Greenhalgh, Professor of Primary Care Health Sciences, University of Oxford
C Raina MacIntyre, Professor of Global Biosecurity, NHMRC L3 Research Fellow, Head, Biosecurity Program, Kirby Institute, UNSW Sydney
David Fisman, Professor in the Division of Epidemiology, University of Toronto

When a Texan farm worker caught bird flu from cattle recently, social media was abuzz with rumours. While bird flu is not a human pandemic, scientists and policymakers the world over are keen to prepare as best they can for when such a pandemic emerges – a tricky task, given that science is messy,…

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