Study: Masks with valves, face shields not effective
Edited By WION Video Desk
Published: Sep 02, 2020, 22:02 IST | Updated: Sep 02, 2020, 22:02 IST
A new study reveals that plastic face shields or masks fitted with a valve can spray invisible droplets over a very wide area when they sneeze or cough, making the devices ineffective at preventing the spread of coronavirus when used on their own.
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