Can masks reduce the risk of catching Covid?
14 December 2021
Professor Andrew Hayward (UCL Institute of Epidemiology & Health) explains how research into the effectiveness of masks against Covid is carried out and examined.
![Picture of masks](https://www.ucl.ac.uk/epidemiology-health-care/sites/epidemiology_health_care/files/styles/large_image/public/masks_photo-1606306823929-94540e36f1e2.jpg?itok=DE0b1U-T)
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