> Because mask wearing by infected people can reduce transmission risk, and because of the high proportion of asymptomatic infected individuals and transmission

> Because mask wearing by infected people can reduce transmission risk, and because of the high proportion of asymptomatic infected individuals and transmissions, there appears to be a strong case for the effectiveness of widespread use of face masks in reducing the spread of COVID-19. However, there is no direct evidence thus far on the magnitude of such effects, especially at a population level. Thank you for the link.