Face Shield vs Mask: A French Study
https://twitter.com/WENDLINGJeanMi1/status/1331366029281341442
In xtreme cfg (25 cm apart, aerosols emitting 3000 times more micro-particles/sec than speech), barrier effect was compared with a particule counter w/ integrated pump (6 chan) placed at the lvl of the mouth. 6 different protective configurations were tested repeated 10x.
- The only protection of the recipient shows a much more effective attenuation by the face shield 54.8% than the mask 21.8% (including for aerosols of less than 0.3 microns; p = 0.003)
- The only control at the source is much more effective for the screen and the mask (96.7% NS)
- The dual protection of transmitter> <receiver is even greater and attenuates by 98% for the screen vs the 97.3% mask (p = 0.02).
This study confirms the results of the 3 previous studies w/ different technical approaches = Ronen (water-sensitive paper aerosols), Viola (BOS) and Arumuru (laser imaging).
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