The spittle is drastically reduced when he wears a double-layered mask or a three-layer surgical mask. 'A surgical mask was the best among all the tested scenarios in preventing droplet spread from any respiratory emission. 'These visualisations show the value of using face masks and the difference between types of masks. 'The results suggest that face masks can help to reduce droplet transmission, though this is not quantitatively demonstrated. 'Although the images indicate that face masks do reduce droplet emission, it is clearly not eliminated, emphasising that face masks are not a replacement for physical distancing measures.

Source: Daily Mail July 23, 2020 22:32 UTC