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Masks help prevent the spread of SARS-CoV-2, the virus that causes COVID-19, yet masking policies in the west have featured some spectacular policy wrong turns, says Professor Trish Greenhalgh.
Masks help prevent the spread of SARS-CoV-2, the virus that causes COVID-19, yet masking policies in the west have featured some spectacular policy wrong turns, says Professor Trish Greenhalgh.