Thread by @DrEricDing

📍N95 MASKS WORK—"We found combination of a #N95 mask that passed a quantitative fit-test & portable #HEPA filter **provided near complete protection** against high viral aerosol loads at close range for prolonged periods of time"—while surgical did not. academic.oup.com/jid/article/22…

2) Damning—“Critically, surgical masks provided inadequate protection against skin and upper airway contamination, even when combined with HEPA filtration and at distances of 2.70 m."

Lesson—use #N95 masks, not just flimsy surgical masks. @projectn95

3) Please remember that #COVIDisAirborne — very much so. Which means faceshields and plexiglass are minimal benefit — and hence any health leader who still tells you to use them or tells you to not get N95 or KN95 or KF94– needs to get dismissed.

https://twitter.com/drericding/status/1471054758085632002

4) Yes, there are govt health officials who are complete imbeciles like Dr Bonnie Henry of BC 🇨🇦 who denies the primacy of aerosol spread, denies the utility of N95s, and denies that BC's unsafe schools fuel transmission. HT @frozen
#bcpoli #bced #cdnpoli

5) Once aerosol transmission is established, we need to disperse aerosols quickly. Key is ventilation if disinfection not possible. 🇯🇵 assumed it was airborne from the beginning. Here is how to ventilate school classrooms if unable to open window. #COVID19

6) Lots of questions about KN95—theoretically they are as good but only if they are genuine and if they have TIGHT FIT as N95s that have head straps. But too often KN95 are slightly loose—I still wear them but tight as possible. TIGHTEN THE FIT—it matters—don’t cheat yourself 👇

https://twitter.com/drericding/status/1425509411267690500