You need a good quality surgical mask plus a mask fitter like the one made by @FixTheMask.
A disposable face mask made out of meltblown polypropylene layer that passes the candle test is likely good.
Why aren't we wearing better masks? Last April, we\u201419 experts\u2015wrote paper on why cloth masks were a good stop-gap measure for COVID. It's just been published in PNAS. Great but... @jeremyhoward and I wrote about our frustration that it's still relevant! https://t.co/tsKHCdQlxr pic.twitter.com/3eoia1B3Ue
— zeynep tufekci (@zeynep) January 13, 2021
2/ Key take away @zeynep @ScottGottliebMD @DrTomFrieden @EricTopol @DrEricDing @ASlavitt: we can all upgrade our masks cheaply. Conditional indoor infection probabilities as low as <0.0001 (0.01%) per hour might be reached with the use of surgical masks and mask fitters alone. pic.twitter.com/bWdWeiZNUS
— David Keating (@DavidLKeating) January 6, 2021
This is ridiculous. Students were asked for their views on this example and several others. The study findings and conclusions were about student responses not the substance of each case. Could\u2019ve used hypotheticals. The responses not the cases were the basis of the conclusions.
— Eric Kaufmann (@epkaufm) February 17, 2021
The UK govt\u2019s paper on free speech in Unis (with implications for Wales) is getting a lot of attention.
— Richard Wyn Jones (@RWynJones) February 16, 2021
Worth noting then that an important part of the evidence-base on which it rests relates to (demonstrably false) claims about my own institution
1/https://t.co/buoGE7ocG7