What to do when covid isolating?#MaskRAT 😷 🐀

This illustrates:
1) importance of masking for source control
2) overdispersed nature of transmission

Top mask worn for ~45 min by person with strong RAT nasal swab, mask tested within 5 min, inside of mask was dry.

1/4
In this N of 2 experiment, the strength of RAT result on standard throat/nasal swab correlated with #MaskRAT result.

The bottom person (me) had multiple negative #MaskRATs and barely detectable nasal/throat RAT for 1 day (day 5)

2/4
An unfortunate finding during my RAT experiments:
My symptomatic children never tested positive on a RAT and I never tested positive on the RATs available in ON.

Without access to PCR testing for kids and case reporting in schools, we’re intentionally flying blind.

3/4
I hope those at @OttawaHealth and @PublicHealthON try out a #MaskRAT. It’s hard not to ask the #COVIDBreathers in your homes, classes and workplaces to mask up after seeing the results

#COVIDisAirborne
#MasksWork
#BetterMasksWorkBetter
#ReleaseTheRespirators

4/4

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More from @JenniferKShea

Feb 13
#BetterMasks for kids < 5 yo

☑️ Filtration
☑️ Fit
☑️ Function

A short thread 🧵

1/
Optimize filtration material:

☑️Surgical masks are good
Look for ASTM-rated

✅Respirators are best
Look for standardized filters:
Canadian - 95PFE
South Korean- KF94
Chinese - KN95

2/
You won’t find a NIOSH certified “N95” for children.

NIOSH only regulates products for adults.

3/
Read 12 tweets
Jan 10
#BetterMasks #FitFiltrationFunction

@masknerd’s google docs excel sheet tabulating all his mask testing results is a goldmine of information!

I highlighted some of his data in the pictured table to further explore the validity of the “well-fitting medical mask” narrative

1/
A few ASTM level 3 surgical masks were tested. Worn without modification, they had a filtration efficiency of 35-78% (via particle counter).

(Side note- don’t twist the ear loops- it makes the fit worse)

Is > 20% leak well-fitting? Not in my books.

2/
With a mask brace to improve seal, the surgical masks performed better: > 92% filtration efficiency, not quite well-sealed N95 quality

To pass a formal quantitative fit test for respirators (ie N95s), one must achieve at least 99% filtration efficiency (fit factor of 100).

3/
Read 12 tweets
Jan 8
Looking for a #BetterMask but:
✖️N95s are harder to find than TP in 2020
✖️you can’t afford N95s and your government isn’t making them accessible
✖️your workplace mandates medical masks and doesn’t allow N95s
✖️your school gives students medical masks

This 🧵‘s for you

1/
Ensure your medical mask is ASTM graded and is at least a grade 2 mask, preferably grade 3 (will ensure better filtration performance of the mask material)

Important to note, ASTM 3 does not imply or guarantee respirator-quality filtration performance.

2/
For kids and those with smaller faces, try the #KnotTuckTape

Turn that rectangle into something more face-shaped. I think taping the corners is important otherwise the tucked in edges often unfold fairly quickly.

3/
Read 8 tweets
Dec 19, 2021
To the experts insisting “N95s are useless if not fit-tested”

Have you ever tried to fit test a “well-fit surgical mask” or “3 layered well-fit cloth mask”?

TLDR they are inferior.

A brief case series and 🧵

1/15
There are two type of fit tests, 1) quantitative fit testing - a portacount machine measures the concentration of aerosol outside the mask versus inside the mask and 2) qualitative fit testing - a potent bitter or sweet aerosolized solution is inhaled under a hood

2/15
I underwent quantitative fit testing on a surgical mask, suboptimally fit KN95 and well fit CN99 (FFP3). The results were intuitive. The surgical mask, while still offering some protection, performed the worst.

3/15
Read 15 tweets
Oct 17, 2021
We've summarized the literature supporting airborne transmission of COVID-19 & several other respiratory pathogens. Guess what? #COVIDisAirborne #FluisAirborne #SARSisAirborne #MERSisAirborne

Live version of table & refs: tinyurl.com/2dhb2xny

@jmcrookston @jljcolorado
1/
If anyone has feedback or peer-reviewed publications to add, please share

3/
Read 10 tweets
Jul 28, 2021
TL;DR The Tome of Nuance

IMHO this review muddies the messages and flip flops on key mitigation strategies
When the science and our understanding evolves, it’s important to communicate this clearly and concisely to the public rather than fall back on nuance and shades of gray. Even when this means admitting that previous messaging was incorrect.
Side tweet - Probably could have saved some pages by omitting the giant shades of gray diagram - not a difficult concept
Read 7 tweets

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