Scientific evidence supports the use of face masks to reduce COVID-19 spread, mainly by preventing infectious liquid particles from reaching uninfected people
Evidence indicates that contact with infectious liquid particles is the main mode of COVID-19 transmission. Masks act as a simple physical barrier to reduce the dissemination of these liquid particles generated by people when they cough, sneeze, or speak. Several published studies showed that face masks reduce the spread of viral infectious diseases like COVID-19. Wearing masks outdoors is also important if spending prolonged periods of time in close contact with other people.