COVID-19: How much protection do face masks offer?

Face masks combined with other preventive measures, such as frequent hand-washing and social distancing, help slow the spread of the coronavirus (SARS-CoV-2) that causes COVID-19. _______________________________ So why weren't face masks recommended at the start of the pandemic? At that time, experts didn't know the extent to which people with COVID-19 could spread the virus before symptoms appeared. [...]
Source: News from Mayo Clinic - Category: Databases & Libraries Source Type: news