There remain differences of opinion among scientists on how effective non-medical masks are in reducing COVID-19 transmission. However, on the question of medi

There remain differences of opinion among scientists on how effective non-medical masks are in reducing COVID-19 transmission. However, on the question of medical-grade masks, there is clear research that now shows some masks (e.g. FFP3 masks) are effective in stopping COVID-19 infection. Covid: Masks upgrade cuts infection risk, research finds: https://www.bbc.co.uk/news/health-57636360 https://www.bbc.co.uk/news/health-57636360