The Telegraph Do face masks work? Here’s what the science says Laboratory testing by Northeastern University, in Boston, found that surgical masks block out 75 per cent of respiratory-droplet-size particles, while the University of Hong Kong found that loose-fitting surgical masks block almost all contagious droplets breathed out by infectious people.
The Telegraph Do face masks work? Here’s what the science says Laboratory testing by Northeastern University, in Boston, found that surgical masks block out 75 per cent of respiratory-droplet-size particles, while the University of Hong Kong found that loose-fitting surgical masks block almost all contagious droplets breathed out by infectious people.
The Telegraph Do face masks work? Here’s what the science says Laboratory testing by Northeastern University, in Boston, found that surgical masks block out 75 per cent of respiratory-droplet-size particles, while the University of Hong Kong found that loose-fitting surgical masks block almost all contagious droplets breathed out by infectious people.