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Catherine Clase · @cmclase
367 followers · 575 posts · Server qoto.org

➡️ Please consider boosting; remember on Mastodon there's no algorithm and 'liking' is only seen by the author

➡️ The best mask is an N95, but all masks work

➡️ Double masking or overmasking

➡️ FAQs are:

❓ Does it make a difference?

❓ Which mask should go on top, the cloth mask or the medical mask?

❓ What about two cloth masks?

❓ Or two medical masks?

➡️ Answers at updated page:

maskevidence.org/double-maskin

.

#WeNotMe #MaskUp #maskmandatenow #FFP2 #ffp3 #CovidIsNotOver #ventilation #filtration #WearAMask #CovidLong #LongCovid #SystemsApproaches #COVIDisAirborne #DoAllTheThings #BringBackMasks #MasksSaveLives #maskmandate #N95s #BetterMasks #MasksWork #paidsickdays #MaskeAuf #n95 #n99

Last updated 1 year ago
Original post

Catherine Clase · @cmclase
315 followers · 430 posts · Server qoto.org

Which year saw the most deaths from Covid in Canada?

Wear the best mask available
The best mask is an N95

maskevidence.org/mask-types

#COVIDisAirborne #CovidIsntOver #CovidIsNotOver #DoAllTheThings #WearAMask #BetterMasks

Last updated 2 years ago
Original post

Catherine Clase · @cmclase
313 followers · 424 posts · Server qoto.org

New eligibility for PCR testing in Ontario.
symptoms plus
➡️Everyone >60y
➡️>18y with a high-risk condition
➡️>18y with <2 vaccine doses
➡️>18y with >6m since last vaccine or last Covid infection
➡️ all the previously eligible groups (frontline workers, pregnant people, people who are immunocompromised etc)

ontario.ca/page/covid-19-testi

eligibility expanded too (same page, scroll down):
➡️Everyone >60y
➡️>18y with a high-risk condition or immunocompromised
➡️>18y with <2 vaccine doses
➡️>18y with >6m since last vaccine or last Covid infection

Where to get tested:
ontario.ca/assessment-centre-l

Self-certify 'I'm eligible' if you are in one of those groups.

In |Hamilton

stjoes.ca/coronavirus/covid-19

Don't rely on test-and-treat or vaccination. Prevent community transmission to a vulnerable person and prevent with and

.

maskevidence.org/why-masks-mat

#COVID #BetterMasks #MasksWork #SystemsApproaches #COVIDisAirborne #CovidIsNotOver #DoAllTheThings #filtration #paidsickdays #BringBackMasks #WearAMask #MasksSaveLives #MaskeAuf #MaskUp #PAXLOVID #hamont #LongCovid #masks #ventilation #maskmandate #maskmandatenow #CovidLong #N95s #n95 #FFP2 #ffp3 #n99 #CovidTesting #bringbacktesting

Last updated 2 years ago
Original post

Catherine Clase · @cmclase
310 followers · 423 posts · Server qoto.org
Masks in Schools — Masks to Prevent Respiratory Infection

Please boost

➡️*New resource* for advocates for Masks in Schools

➡️We have created a FAQ page and a downloadable, customizable template summarizing arguments for mask requirements in schools:

maskevidence.org/masks-in-scho

➡️Mask mandates in schools reduce student and teacher absences

tinyurl.com/ps3jpk6a

➡️4% of children with COVID will get long covid

tinyurl.com/mryp6zvh

@MyraBatchelder @nilikm

.

#CovidLong #LongCovid #WeNotMe #CovidIsNotOver #DoAllTheThings #paidsickdays #FFP2 #BetterMasks #MasksWork #n95 #n99 #COVIDisAirborne #ventilation #MasksSaveLives #MaskeAuf #MaskUp #maskmandatenow #SystemsApproaches #filtration #BringBackMasks #WearAMask #maskmandate #N95s #ffp3

Last updated 2 years ago
Original post

Catherine Clase · @cmclase
307 followers · 423 posts · Server qoto.org
Mask Hierarchy — Masks to Prevent Respiratory Infection

#ventilate #COVIDisAirborne #WearAMask #SystemsApproaches #CovidIsNotOver #DoAllTheThings #ventilation #filtration #paidsickdays #BringBackMasks #MasksSaveLives #MaskeAuf #MaskUp #maskmandate #maskmandatenow #CovidLong #LongCovid

Last updated 2 years ago
Original post

Catherine Clase · @cmclase
307 followers · 421 posts · Server qoto.org

➡️One of the wisest commentators on the climate crisis for years, @georgemonbiot writes about our need to take care of each other

➡️We need to maskevidence.org/mask-types

➡️We need to
itsairborne.com
cleanaircrew.org

.

#CovidIsNotOver #ventilation #maskmandate #maskmandatenow #LongCovid #WearAMask #ventilate #DoAllTheThings #filtration #paidsickdays #BringBackMasks #MasksSaveLives #MaskeAuf #MaskUp #CovidLong #COVIDisAirborne #SystemsApproaches

Last updated 2 years ago
Original post

Catherine Clase · @cmclase
307 followers · 421 posts · Server qoto.org

@michael @trendless

Have you tried the Vitacore Can99?

shop.vitacore.ca/pages/ppe-saf

Some curated lists of N95s on our website

maskevidence.org/findingn95s

Which mask should I wear?

Includes downloadable infographic/poster

maskevidence.org/mask-types

Also I'd like to post curated lists of where to get FfP2/3 in Europe and Australia. Does anyone know of any sites like @ProjectN95 or outside North America?

and .

#MasksSaveLives #MaskUp #maskmandate #CovidLong #Masks4Canada #COVIDisAirborne #CovidIsNotOver #DoAllTheThings #ventilation #filtration #paidsickdays #BringBackMasks #WearAMask #MaskeAuf #maskmandatenow #LongCovid

Last updated 2 years ago
Original post

Catherine Clase · @cmclase
273 followers · 321 posts · Server qoto.org

So...1 in 24 Canadians has Covid, XBB1.5 (kraken) variant is projected to be at 22% in Ontario by the end of the week, people are still dying of Covid (279 in Canada in the first week of January), and though voluntary mask wearing is low, 69% of Canadians support mask mandates if necessary.

Public health in many regions recommends or strongly recommends mask wearing.

But no mask mandates?
Not even in education and the workplace?
Nothing?

Mandates would make it so much easier for the caring majority to normalize wearing a mask again. Many people understandably don't want to unless it is clearly necessary. are necessary to get mask wearing in public up to >80%, which IHME estimates would halve deaths from covid with a month.

In the absence of clear direction from public health, and protect yourself and those around you as best you can.

maskevidence.org/why-masks-mat

Tara Moriarty's lab's estimates of current infections and risk: twitter.com/MoriartyLab/status

Incomplete count of deaths from Covid in Canada: health-infobase.canada.ca/covi

CTV/Nanos Nov 2022 poll of Canadians: ctvnews.ca/health/coronavirus/

IHME projections: covid19.healthdata.org/canada?

#MaskUp #COVIDisAirborne #CovidIsNotOver #DoAllTheThings #ventilation #paidsickdays #BringBackMasks #maskmandate #CovidLong #LongCovid #SystemsApproaches #filtration #MasksSaveLives #maskmandatenow #WearAMask #MaskMandates #MaskeAuf #BetterMasks

Last updated 2 years ago
Original post

Catherine Clase · @cmclase
273 followers · 321 posts · Server qoto.org
Open media

@holmesr @Pat

Hi again. Thanks for the feedback and for engaging, much appreciated.

We think overhead elastic is critical to getting good fitted-filtration (ie, net filtration of a mask on a face). We summarize this here ⬇️

maskevidence.org/head-attachme

In North America, must have overhead elastic simplifying our advice in favour of these over or

There are data on beards, too!

For a 10mm beard, an N95 is still more effective than all other masks.

nature.com/articles/s41370-021

If the stifling feeling is specifically associated with headstraps for you, they could be too tight. Aura 3M has simple band elastic straps that lengthen with a good hard tug. This is a pro in this situation for you.

For straps that don't lengthen so easily, consider an with braided elastic such as Vitacore's .

Vitacore's Can99 also has superb breathability so if the problem isn't the attachments, this might help.

Apologies for a N American reply to a European question.

Anyone curating info on or and suppliers please let me know: we would love to put this on our website.


#WearTheBestMaskAvailable #BetterMasks #MaskUp #MasksSaveLives #MaskeAuf #maskmandate #LongCovid #ffp3 #COVID #MaskMandates #masks #WearAMask #DoAllTheThings #BringBackMasks #maskmandatenow #CovidLong #N95s #KN95 #KF94 #n95 #FFP2 #Can99 #CovidIsNotOver #CovidIsntOver #ventilation #filtration #paidsickdays #beards

Last updated 2 years ago
Original post

Catherine Clase · @cmclase
273 followers · 321 posts · Server qoto.org

#DoAllTheThings #WearTheBestMaskAvailable

Last updated 2 years ago
Original post

Catherine Clase · @cmclase
254 followers · 279 posts · Server qoto.org

➡️ I'm seeing a lot of "N95s work and other masks do not"

➡️ Filtration is relative, not absolute

➡️ Summary and infographic ⬇️
maskevidence.org/mask-types

⬇️%s are filtration percentages for submicron (less than 1 micron) particles - aerosol data - the relevant size because

90% N95s without fit testing
70% Level 1 medical with cotton overmask
50% Level 1 medical or well-fitting 2-layer cotton

What does it mean?

➡️ Wear the best mask available

If you have access to N95s or FFP3s with overhead elastic, wear them

Otherwise use what you have: any mask is better than no mask

A certified medical mask with a good-fitting cloth mask over the top to improve the edge seal is a great low-cost combo

Mask braces are a bit uncomfortable but is you are in a high-risk situation (eg health care worker not supplied with routine N95s) they greatly improve the filtration of medical masks


#WearTheBestMaskAvailable #MaskMandates #CovidIsNotOver #DoAllTheThings #COVID #WearAMask #paidsickdays #maskmandatenow #COVIDisAirborne #ventilation #filtration #CovidLong #LongCovid #MaskUp #masks #CovidIsntOver #BetterMasks #BringBackMasks #MasksSaveLives #MaskeAuf #maskmandate

Last updated 2 years ago
Original post

Catherine Clase · @cmclase
109 followers · 262 posts · Server qoto.org

It's taken me a while to figure out how to write an . Here goes:

I’d appreciate a boost to help meet like-minded here.

I’m a professor of medicine at McMaster University ,

Clinically, I work as a ()

I’m an associate member of () at

I’m a member of the Centre of Excellence in Protective Equipment and Materials (, , ) at

My is in (, , ) and

I’m editor-in-chief of (@CanJKHD on the birdsite, not here yet) an kidney journal with :

(, ) journals.sagepub.com/doi/full/
theconversation.com/peer-revie

(was your hard work rejected by a journal with IF>=4? Submit clean, redline, point-by-point response-to-reviews, and tell us which journal and undertake that you responded to all reviews received)
us.sagepub.com/en-us/nam/canad

I’m editor-in-chief of maskevidence.org/ which curates evidence on and

For the pandemic, we need because and .

I’d like to see as the tag to find others with interest in and .

Also trying to be ally, working on , interested in .

Treaty 3|Dish with One Spoon, Turtle Island; Hamilton ON Canada. She/her

#MacDeptMed #KidneyDoctor #Nephrology #HEI #epidemiology #ppe #n95 #CEPEM #clinicalresearch #KidneyEpi #potassium #CKDProgression #KidneyKindness #PortableReview #CovidIsNotOver #DoAllTheThings #ventilation #BringBackMasks #WearAMask #MasksSaveLives #MaskUp #maskmandate #CovidLong #LongCovid #AskKidney #AskRenal #edi #introduction #mcmasteru #kidneydisease #Ckd #masks #CJKHD #openaccess #PublishingPolicy #SupportiveReview #kindness #BetterMasks #MasksWork #SystemsApproaches #COVIDisAirborne #filtration #paidsickdays #lgbtq #diversity #socialjustice #MaskeAuf #maskmandatenow #KidneyVerse #kidneyhealth #lgbtq2 #equity #inclusion #urbanplanning

Last updated 2 years ago
Original post