Researchers tested coverings ranging from the kind worn by healthcare professionals to neck fleeces and knitted masks.
were also shown to perform well and eliminated a substantial amount of the spray from normal speech.Mr Fischer said:"We confirmed that when people speak, small droplets get expelled, so disease can be spread by talking, without coughing or sneezing.
"We could also see that some face coverings performed much better than others in blocking expelled particles." Eric Westman, one of the authors of the study, said:"Wearing a mask is a simple and easy way to reduce the spread of"About half of infections are from people who don't show symptoms, and often don't know they're infected. They can unknowingly spread the virus when they cough, sneeze and just talk."In the absence of a vaccine or antiviral medicine, it's the one proven way to protect others as well as yourself.
Participants in the study wore one of the coverings before speaking into the direction of a laser beam inside a black box. Droplets from the person's breath would then scatter light as they moved through the laser beam. This process was recorded using a mobile phone camera.Image:The league table of the 14 masks tested :
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