Thread by @DearPandemic

1/ Q. Do face shields work & are they better than masks?

Most media attention has focused on the use of masks. We're here to report: Face shields are protective too!⁠

2/ Face shields create a transparent rigid plastic barrier that covers the entire face from ear to ear & from forehead to the bottom of the chin. ⁠
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The shield physically blocks viral entry (through eyes, nose, or mouth) & reduces auto-inoculation from touching one's face. ⁠

3/ ⁠Simulation studies indicate that face shields are effective at preventing inhalation of cough aerosol droplets, with one estimate showing 96% protection from viral exposure within 18 inches of a cough.
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4/ We see other benefits to face shields, especially for children who may be heading back to school. Face shields are easy to wear, & their transparency allows others to see full expressions and lip movement.

5/ It's also a physical reminder, in fact a barrier, to avoid touching any part of your face.

Further, face shields can be created at home from items readily available at craft stores. And finally, face shields can be disinfected and reused.⁠

6/ So back to your original question, which is better: face shield or face mask? ⁠

7/ Our cautious response: ⁠

If you can't #SocialDistance & other people aren't wearing 😷, wear BOTH a mask and a face shield. A mask will primarily help protect others from you (if you are asymptomatic/pre-symptomatic) & a face shield will help protect you from others.⁠
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