Study says face mask need multiple layers

Transcript

A new study suggests masks are more effective if they have two or three layers of protection.

The findings were found in a video case study published online in the Journal “Thorax.”

Researchers say home-made cloth face masks likely need a minimum of two layers but preferably three to prevent inhaling droplets generated during coughing, sneezing or speaking.

Researchers use a tailored LED lighting system and a high-speed camera to film the dispersal of airborne droplets produced by a healthy person with no respiratory infection, during speaking, coughing and sneezing while wearing different masks.

The video recording shows that the 3-ply surgical face mask was the most effective at reducing airborne droplets dispersal, although even a single layer cloth reduced droplet spread from speaking.

Researchers note that is just one case and that several other factors contribute to the effectiveness of cloth face masks including the material used, design and fit and the frequency of washing.

They also added there is a need for more evidence to inform safer cloth mask design.

Posted – 7.24.20