Catherine Clase
@catherineclase.bsky.social
Professor of medicine, kidney doc, epidemiologist, editor, mask researcher and advocate (airborne)
@docshumanity.bsky.social
Opinions my own
https://www.doctorshumanity.org/petition
https://maskevidence.org
@docshumanity.bsky.social
Opinions my own
https://www.doctorshumanity.org/petition
https://maskevidence.org
Pinned
The idea that 'cloth masks are good only for droplets' still circulates. Many have said this, but it is wrong.
Recommendations about cloth masks, from spring 2020, were based on aerosol evidence
www.acpjournals.org/doi/10.7326/...
#WearTheBestMaskAvailable
1/14
Recommendations about cloth masks, from spring 2020, were based on aerosol evidence
www.acpjournals.org/doi/10.7326/...
#WearTheBestMaskAvailable
1/14
Reposted by Catherine Clase
Proud to support @jennykwan.bsky.social’s bill to close loopholes that let Canadian weapons be funnelled through the U.S. without oversight. With ICE abuses and U.S. arms transfers violating human rights, Canada must not be complicit.
Call your MP.
Join the Feb 17 Day of Action: ArmsEmbargoNow.ca
Call your MP.
Join the Feb 17 Day of Action: ArmsEmbargoNow.ca
February 8, 2026 at 1:29 AM
Proud to support @jennykwan.bsky.social’s bill to close loopholes that let Canadian weapons be funnelled through the U.S. without oversight. With ICE abuses and U.S. arms transfers violating human rights, Canada must not be complicit.
Call your MP.
Join the Feb 17 Day of Action: ArmsEmbargoNow.ca
Call your MP.
Join the Feb 17 Day of Action: ArmsEmbargoNow.ca
Reposted by Catherine Clase
With a number of Olympic athletes donning respirators, this is your reminder that COVID is not over.
It’s airborne, and a well fitted mask is a great way to protect yourself and those around you.
If you can’t afford one, check out your local mask bloc.
If you can afford it, consider donating!
It’s airborne, and a well fitted mask is a great way to protect yourself and those around you.
If you can’t afford one, check out your local mask bloc.
If you can afford it, consider donating!
Worldwide Mask Bloc Directory – Find your local Mask Bloc
MaskBloc.org lists active Mask Blocs around the world. Free high-quality masks, COVID-19 tests and other equipment for your community. Mutual Aid & We Keep Us Safe.
maskbloc.org
February 7, 2026 at 5:23 AM
With a number of Olympic athletes donning respirators, this is your reminder that COVID is not over.
It’s airborne, and a well fitted mask is a great way to protect yourself and those around you.
If you can’t afford one, check out your local mask bloc.
If you can afford it, consider donating!
It’s airborne, and a well fitted mask is a great way to protect yourself and those around you.
If you can’t afford one, check out your local mask bloc.
If you can afford it, consider donating!
Reposted by Catherine Clase
This is counter-intuitive:
"It is clear that the benefits of cycling outweigh the risks, with helmet legislation actually costing society more from lost health gains than saved from injury prevention." theconversation.com/ditching-bik...
"It is clear that the benefits of cycling outweigh the risks, with helmet legislation actually costing society more from lost health gains than saved from injury prevention." theconversation.com/ditching-bik...
Ditching bike helmets laws better for health
With epidemics of diabetes and obesity threatening to bankrupt state health budgets, governments need to broaden their strategies to encourage physical activity. Allowing cyclists to ride without a he...
theconversation.com
February 5, 2026 at 2:18 PM
This is counter-intuitive:
"It is clear that the benefits of cycling outweigh the risks, with helmet legislation actually costing society more from lost health gains than saved from injury prevention." theconversation.com/ditching-bik...
"It is clear that the benefits of cycling outweigh the risks, with helmet legislation actually costing society more from lost health gains than saved from injury prevention." theconversation.com/ditching-bik...
Reposted by Catherine Clase
Analysis of NHANES data from 2021 to 2023 found that 79.1% of US adults with hypertension had blood pressure above the 2025 AHA/ACC goal of <130/80 mm Hg.
ja.ma/4aanrQq
ja.ma/4aanrQq
February 3, 2026 at 12:00 PM
Analysis of NHANES data from 2021 to 2023 found that 79.1% of US adults with hypertension had blood pressure above the 2025 AHA/ACC goal of <130/80 mm Hg.
ja.ma/4aanrQq
ja.ma/4aanrQq
Reposted by Catherine Clase
Immobilized IgG-containing immune complexes require platelets to recruit neutrophils during inflammation
February 3, 2026 at 12:15 PM
Immobilized IgG-containing immune complexes require platelets to recruit neutrophils during inflammation
Reposted by Catherine Clase
Post–intensive care syndrome (PICS) refers to new or worsening physical, cognitive, or mental health impairments experienced by more than half of intensive care unit (#ICU) survivors. 🧵
February 2, 2026 at 5:02 PM
Post–intensive care syndrome (PICS) refers to new or worsening physical, cognitive, or mental health impairments experienced by more than half of intensive care unit (#ICU) survivors. 🧵
Reposted by Catherine Clase
Here is today’s #eyeSCANdy! Corrugated lumen of a renal artery following removal of endothelial cells.
Photo courtesy of Dr. Stephen Bonsib. #renal #pathology #kidneypath
Photo courtesy of Dr. Stephen Bonsib. #renal #pathology #kidneypath
February 2, 2026 at 5:03 PM
Here is today’s #eyeSCANdy! Corrugated lumen of a renal artery following removal of endothelial cells.
Photo courtesy of Dr. Stephen Bonsib. #renal #pathology #kidneypath
Photo courtesy of Dr. Stephen Bonsib. #renal #pathology #kidneypath
Illegal occupation, genocide, ethnic cleansing. Israel's intentions are clear.
www.aljazeera.com/features/202...
www.aljazeera.com/features/202...
‘Regavim’: Israel’s new Rafah border site carries coded annexation message
Israel brands Gaza crossing with Egypt ‘Regavim’ and ‘Nekez’, terms analysts say signal a land grab and dehumanisation.
www.aljazeera.com
February 2, 2026 at 3:41 PM
Illegal occupation, genocide, ethnic cleansing. Israel's intentions are clear.
www.aljazeera.com/features/202...
www.aljazeera.com/features/202...
Reposted by Catherine Clase
Today I published my last story for The Texas Newsroom @KUTNews.
We analyzed years of data from Texas prisons w/o AC and found — more often than not — temps would violate standards for county jails.
Jails must keep temps between 65-85°. State prisons don’t. www.kut.org/crime-justic... #txlege
We analyzed years of data from Texas prisons w/o AC and found — more often than not — temps would violate standards for county jails.
Jails must keep temps between 65-85°. State prisons don’t. www.kut.org/crime-justic... #txlege
Many Texas prisons are regularly topping 90 degrees. The state is about to defend itself in court.
A new comprehensive analysis of state data shows Texas prisons get so hot in summer that temperatures there would routinely violate state standards for other types of lockups. The state will be back i...
www.kut.org
February 2, 2026 at 2:04 PM
Today I published my last story for The Texas Newsroom @KUTNews.
We analyzed years of data from Texas prisons w/o AC and found — more often than not — temps would violate standards for county jails.
Jails must keep temps between 65-85°. State prisons don’t. www.kut.org/crime-justic... #txlege
We analyzed years of data from Texas prisons w/o AC and found — more often than not — temps would violate standards for county jails.
Jails must keep temps between 65-85°. State prisons don’t. www.kut.org/crime-justic... #txlege
The Con Man and His Victims
No one wants to "cool out" Trump supporters
open.substack.com
February 2, 2026 at 2:06 PM
Reposted by Catherine Clase
A coworker took this from her apartment. I haven't seen a crowd this size before. Maybe the first Women's March? But it was much much warmer that day. ICE OUT OF MINNESOTA!
January 23, 2026 at 11:19 PM
A coworker took this from her apartment. I haven't seen a crowd this size before. Maybe the first Women's March? But it was much much warmer that day. ICE OUT OF MINNESOTA!
Reposted by Catherine Clase
Get the numbers straight @nytimes.com
Minnesotans stood in solidarity with a 20-below windchill.
And not thousands, but well over 150k.
That's Bank Stadium in the background. It has a cap of 50k.
There were easily 3x what Minneapolis looks like when a Vikings game ends.
Bravo MN! 🔥
Minnesotans stood in solidarity with a 20-below windchill.
And not thousands, but well over 150k.
That's Bank Stadium in the background. It has a cap of 50k.
There were easily 3x what Minneapolis looks like when a Vikings game ends.
Bravo MN! 🔥
Minnesota standing up to ICE.
And they did it in sub-zero temperatures.
This is the way. Mass protest is the only action, and we are going to see more and more of it.
Just remember:
"The power of the people is greater than the people in power"
And they did it in sub-zero temperatures.
This is the way. Mass protest is the only action, and we are going to see more and more of it.
Just remember:
"The power of the people is greater than the people in power"
Demonstrators Flood Minneapolis Streets as Hundreds of Businesses Close to Protest ICE
www.nytimes.com
January 24, 2026 at 5:09 AM
Get the numbers straight @nytimes.com
Minnesotans stood in solidarity with a 20-below windchill.
And not thousands, but well over 150k.
That's Bank Stadium in the background. It has a cap of 50k.
There were easily 3x what Minneapolis looks like when a Vikings game ends.
Bravo MN! 🔥
Minnesotans stood in solidarity with a 20-below windchill.
And not thousands, but well over 150k.
That's Bank Stadium in the background. It has a cap of 50k.
There were easily 3x what Minneapolis looks like when a Vikings game ends.
Bravo MN! 🔥
Reposted by Catherine Clase
Poetrye ys the technologye of hope
January 22, 2026 at 2:42 AM
Poetrye ys the technologye of hope
Reposted by Catherine Clase
Better headline: PM Carney risks the wrath of the American owned newspaper chain the National Post.
January 21, 2026 at 8:30 PM
Better headline: PM Carney risks the wrath of the American owned newspaper chain the National Post.
Reposted by Catherine Clase
I spoke to the Secretary-General of NATO, Emmanuel Macron, Keir Starmer, Friedrich Merz and Giorgia Meloni.
Together we stand firm in our commitment to uphold the sovereignty of Greenland and the Kingdom of Denmark.
Together we stand firm in our commitment to uphold the sovereignty of Greenland and the Kingdom of Denmark.
January 18, 2026 at 9:04 PM
I spoke to the Secretary-General of NATO, Emmanuel Macron, Keir Starmer, Friedrich Merz and Giorgia Meloni.
Together we stand firm in our commitment to uphold the sovereignty of Greenland and the Kingdom of Denmark.
Together we stand firm in our commitment to uphold the sovereignty of Greenland and the Kingdom of Denmark.
Reposted by Catherine Clase
A nobel peace pryze doth not worke lyke the One Ring. It ys not about who ys physicallye holdinge it.
January 16, 2026 at 9:11 PM
A nobel peace pryze doth not worke lyke the One Ring. It ys not about who ys physicallye holdinge it.
Reposted by Catherine Clase
1/ I recently wrote about Frances Perkins—FDR’s Labor Secretary and first woman cabinet member. She is best known as the architect of the New Deal but she had a lesser-known achievement:
She dismantled her era’s version of ICE.🧵
She dismantled her era’s version of ICE.🧵
January 14, 2026 at 3:43 AM
1/ I recently wrote about Frances Perkins—FDR’s Labor Secretary and first woman cabinet member. She is best known as the architect of the New Deal but she had a lesser-known achievement:
She dismantled her era’s version of ICE.🧵
She dismantled her era’s version of ICE.🧵
Reposted by Catherine Clase
This should be criminal because it’s puts patients actually enrolled in the trial at risk without any potential benefit due to an unpowered trial due to enrolling patients without the disease and non-adherence. Shame on this involved.
January 13, 2026 at 5:11 AM
This should be criminal because it’s puts patients actually enrolled in the trial at risk without any potential benefit due to an unpowered trial due to enrolling patients without the disease and non-adherence. Shame on this involved.
Reposted by Catherine Clase
Remember the TOPCAT story of what happened in Russia and Georgia?
This is worse: www.science.org/content/blog...
And in South Florida.
From @dereklowe.bsky.social
This is worse: www.science.org/content/blog...
And in South Florida.
From @dereklowe.bsky.social
January 12, 2026 at 7:13 PM
Remember the TOPCAT story of what happened in Russia and Georgia?
This is worse: www.science.org/content/blog...
And in South Florida.
From @dereklowe.bsky.social
This is worse: www.science.org/content/blog...
And in South Florida.
From @dereklowe.bsky.social
Reposted by Catherine Clase
If you are a foreign policy wonk - or want to follow one - connect with @senboehm.bsky.social, Canada's former ambassador to Germany, and chair of the Foreign Affair Committee or with @ypwoo.bsky.social, an economic with expertise in the Asia-Pacific relations. #cdnpoli
January 12, 2026 at 1:19 AM
If you are a foreign policy wonk - or want to follow one - connect with @senboehm.bsky.social, Canada's former ambassador to Germany, and chair of the Foreign Affair Committee or with @ypwoo.bsky.social, an economic with expertise in the Asia-Pacific relations. #cdnpoli