Not sure.
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Replying to @DanielleFong @stewartbrand
Because only wearing a face shield won't protect you from particles going around the face shield. Sometimes a false sense of security is worse than not doing anything at all...
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Replying to @Pravduh15 @stewartbrand
It maybe be a matter of what is the fraction of the particles that are reduced, especially as compared to the N95 mask, which supposedly capture 95%, but it's actually all over the place.
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Replying to @DanielleFong @stewartbrand
Imagine breath forms an aerosolized cloud, like smoke. If you exhale that smoke through fabric and someone else was wearing a fabric mask, would that be preferable to a face shield?
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Replying to @Pravduh15 @stewartbrand
generally, I would say yes, but there are numerous problems with the mask shortage. people are taking them off, a lot, they are reusing them which could cause other diseases, when they take them off and put them on they could infect themselves, usage is inconsistent...
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Replying to @DanielleFong @stewartbrand
Adding a face shield over a mask isn't a terrible idea (and would protect eyes), but a face shield alone isn't sufficient. I would guess that most problems are people not wearing masks. There's a lot of that going around.
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Replying to @Pravduh15 @stewartbrand
🤷🏻♀️ Retweeted Stewart Brand
🤷🏻♀️ added,
Stewart BrandVerified account @stewartbrandThe best paper on this I've now seen -- face shields appear to be better than masks, including on aerosols. (Thanks to John@markoff) April 29, 2020 - "Moving Personal Protective Equipment Into the Community: Face Shields and Containment of COVID-19" https://jamanetwork.com/journals/jama/article-abstract/2765525 …Show this thread2 replies 0 retweets 0 likes -
I think the relevant passage. Basically, it's an effective protection against short range coughs, but it's not enough for the small particular which this study is suggesting a good model.pic.twitter.com/qJ41ZgNhr6
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"Thus, face shields provide a useful adjunct to respiratory protection for workers caring for patients with respiratory infections. However, they cannot be used as a substitute for respiratory protection when it is needed."https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4734356/ …
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it was the final reference in the paper you linked.
https://jamanetwork.com/journals/jama/article-abstract/2765525 …
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