Catherine Clase
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catherineclase.bsky.social
Catherine Clase
@catherineclase.bsky.social
4.6K followers 1.5K following 480 posts
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
Posts Replies Media Videos
catherineclase.bsky.social
Black Canadian kn95 with excellent breathability, foam seal over the nose, and overhead elastic

Not available to ship to Canada

What’s going on, @breatheteq.bsky.social?

Also Canadian, also black with overhead elastic, the Vitacore Can99 does ship to Canada:

shop.vitacore.ca/products/can...
Shipping destinations are Australia, Mexico, New Zealand and US
November 6, 2025 at 5:07 AM
catherineclase.bsky.social
#HamOnt
A blue background, see, distant light green hills, beyond that blue sky with a few fluffy white clouds. Central, a small yacht with 3 white sails, no people, is refected in the water. Text reads (back on pale blue) In support of the freedom flotilla and the arrests by the IOF of its occupants Bring a flag, a banner, sign, or just yoursel Meet at Hamilton city hall 3pm Thurs oct 2 @mivasair.bsky.social
October 2, 2025 at 5:11 PM
catherineclase.bsky.social
Thank you Francesca Albanese for speaking to the North America Refugee Heath Conference and thank you to Michael Lynk for leading the conversation
September 13, 2025 at 8:19 PM
catherineclase.bsky.social
This post has 19K views on the awful site

Please renew my faith in bluesky and circulate this

We are asking all anti-genocide Canadian healthcare workers to sign a letter to @mark-carney.bsky.social

#nephsky #medsky

@docagainstgenocide.bsky.social
@1goodtern.bsky.social
Two QR codes with headings: First QR code: Join Doctors for Humanity This leads to this website: https://shorturl.at/OjWzv Second QR code: Sign the Coalition letter This leads to this website: https://shorturl.at/pMMA9
September 8, 2025 at 5:44 PM
catherineclase.bsky.social
Canadian health workers, please speak out against man-made famine: sign this letter to the government, from the newly formed Canadian coalition of health workers groups

All HCWs: PSWs, paramedics, nurses, doctors, OT, PT, etc

And students and retirees

Please share

docs.google.com/forms/d/e/1F...
A verified photo from Gaza August 2025, of a child victim of famine, wearing only a diaper. It's hard to say their age. No expression on their tiny face. Their arms are like matchsticks. Every rib is visible.
September 6, 2025 at 6:34 PM
catherineclase.bsky.social
This is a verified photo from Gaza, taken in August, of a child victim of famine as a illegal weapon of war.

#mobilize4gaza
A child victim of famine as a weapon or war, in his caregiver’s hands wearing only a white loincloth. Hard to say his or her age. No expression on his tiny face. His arms and legs like matchsticks. Every rib visible. His skin like tissue paper.
September 1, 2025 at 9:18 PM
catherineclase.bsky.social
We are ready for the press conference and vigil on Parliament Hill 11-6 today

“When a missile hits us do we feel pain or die immediately” - a child in Gaza

96% of children in Gaza fell death is imminent

Half of them wish for their own death to escape the brutality of genocide
A photo of the tiny dead bodies of several children When a missile hits us do we feel pain or die immediately” - a child in Gaza 96% of children in Gaza fell death is imminent Half of them wish for their own death to escape the brutality of genocide
August 30, 2025 at 2:55 PM
catherineclase.bsky.social
Stop starving Gaza Updated date and time Sat aug 2 5:30pm Hamilton city hall Bring your pots pans and signs
August 2, 2025 at 1:41 AM
catherineclase.bsky.social
#KillBill5

#hamont
Join Hamilton 350, Environment Hamilton, the Hamilton and District Labour Council (HDLC), the Green Party of Ontario (GPO) and others in a rally to oppose Doug Ford's "Big Beautiful Bill" 5. Speakers will include Craig Cassar (Councillor, Ward 12), Robin Lennox (MPP, Hamilton Centre), Anthony Marco (President, HDLC) and Mike Schreiner (Leader, GPO). Bill 5 is a massive omnibus bill that allows the Ontario Government to roll back environmental protections, gut the Endangered Species Act, create so-called "special economic zones" to exempt companies and projects from provincial and municipal laws and regulations, and disregard the constitutionally protected rights of First Nations people. It's extremely broad and vague, giving the provincial cabinet carte blanche to trample over the democratic checks and balances designed to protect public health and safety, labour standards, human rights, and much more. All this without a debate in the legislature. The PC party under Doug Ford has...
July 7, 2025 at 1:11 AM
catherineclase.bsky.social
IOF soldiers admitting to atrocities

Gift link:

www.haaretz.com/isra...

Black headline on white background: 'It's a Killing Field': IDF Soldiers Ordered to Shoot Deliberately at Unarmed Gazans Waiting for Humanitarian Aid Subheading, also black text white background: IDF officers and soldiers told Haaretz they were ordered to fire at unarmed crowds near food distribution sites in Gaza, even when no threat was present. Hundreds of Palestinians have been killed, prompting the military prosecution to call for a review into possible war crimes ■ Netanyahu, Katz reject claims, call them 'blood libels'
June 27, 2025 at 11:54 PM
catherineclase.bsky.social
Banking on war crimes and g n0c1d3

Read Just Peace Advocates' analysis of #Canada's top 5 banks

shorturl.at/TGAEA

US$132 billion investments in 66 companies implicated in illegal activities in the Occupied Palestinian Territory (oPt).

~CAD$183 billion

Shame on you
RBC USD 61 billion TD USD 19 billion BMO USD 22 billion Scotiabank USD 18 billion CIBC USD 11 billion
June 26, 2025 at 6:43 PM
catherineclase.bsky.social
In case anyone needs a reminder of how good we were at preventing Covid-19 from spreading until we decided not to

www.covid19immunityt...

#WearTheBestMaskAvailable

dx.plos.org/10.1371/...
Covid-19 vaccine uptake and seroprevalence by province. Vaccine uptake goes from 0 to 95% between Jan 2021 and July 2021. Seroprevalence for anti-S antibodies mirrors this. Seroprevalence for covid infection (anti-N antibodies) is at 10-15% in Jan 2022. By Jan 2023, it is 70-75% and by Jan 2024 it is 85-95% Each individual study is represented by a dot. The lines represent best fit through the data
June 23, 2025 at 9:10 PM
catherineclase.bsky.social
#FreePalestine

Toronto just now
June 22, 2025 at 10:26 PM
catherineclase.bsky.social
Today in #Toronto

Please turn out, show US and @mark-carney.bsky.social that we want no part of this

We resisted in 2003, resist again now

#HamOnt this may be our nearest protest

maps.app.goo.gl/kv2TrVaRncN1...
Poster in red, green, black, saying: No war on Iran End the genocide in Gaza Fund healthcare, education, housing, not war Toronto Rally Sunday June 22 4pm US Consulate
June 22, 2025 at 4:41 PM
catherineclase.bsky.social
@mark-carney.bsky.social Keir Starmer

The grave threats to international security are:

Israel's nuclear weapons
Israel's unprovoked attack on Iran
America's unprovoked attack on Iran
Israel's ongoing practice of genocide and apartheid
Canadian and UK complicity in the above

#BDS
Iran’s nuclear programme is a grave threat to international security, and Canada has been consistently clear that Iran can never be allowed to develop a nuclear weapon. While U.S. military action taken last night was designed to alleviate that threat, the situation in the Middle East remains highly volatile. Stability in the region is a priority. Canada calls on parties to return immediately to the negotiating table and reach a diplomatic solution to end this crisis. As G7 leaders agreed in Kananaskis, the resolution of the Iranian crisis should lead to a broader de-escalation of hostilities in the Middle East, including a ceasefire in Gaza. Iran’s nuclear programme is a grave threat to international security. Iran can never be allowed to develop a nuclear weapon and the US has taken action to alleviate that threat. The situation in the Middle East remains volatile and stability in the region is a priority. We call on Iran to return to the negotiating table and reach a diplomatic solution to end this crisis.
June 22, 2025 at 3:57 PM
catherineclase.bsky.social
The UK is complicit in genocide

People of conscience:

Watch this: tinyurl.com/47bpjyan

Sign this to demand the expulsion of the Israel ambassador from the UK

chng.it/6FCH4tTV via @ukchange.bsky.social

This was a newly renovated dialysis unit before it was destroyed by the IOF ⬇️
Noor Al Kaaba dialysis unit lies in ruins. Around it a few badly damaged buildings stand in a field of rubble as far as the horizon. There are no people, animals, or vegetation, everything is brown and grey.
June 14, 2025 at 1:19 AM
catherineclase.bsky.social
#Pledge4Humanity #Pledge2EndGenocide
To Political Leaders worldwide, and to all Regional, National and International Health Authorities, We write as healthcare professionals, and organizations committed to humanitarian health, from across the globe, to demand immediate and unequivocal action to end the ongoing genocide in the Gaza strip. Expressions of “concern” and inaction from political leaders have become morally indefensible. There is a deafening silence of regional, national and international health institutions in the face of deliberate starvation, mass slaughter of children, and targeting of civilians, including healthcare workers. This is a betrayal of our most fundamental oaths to uphold humanity, to preserve life and to do no harm. We, as healthcare providers, are bound by professional ethics and international humanitarian law, to speak and to act whenever civilians are denied access to critical medical care. In Gaza, the evidence is irrefutable. The scale of the humanitarian crisis has reached shameful and apocalyptic levels. Yet, the institutions that should preserve human dignity are woefully silent. Israel’s politicians has made their intentions clear. Israel intends to continue ethnically cleansing the Gaza strip.(1-2) “We are destroying more and more homes. They have nowhere to return to. The only outcome will be the desire of Gazans to emigrate outside the Gaza strip.” Israeli Prime Minister Benjamin Netanyahu Israel’s objective is to destroy “everything that’s left of the Gaza strip. Conquering, cleansing and remaining in Gaza” Finance Minister of Israel Bezamel Smotrich “We cannot have women and children getting close to the border…anyone who gets near must get a bullet in the head.” National Security Minister of Israel Itamar Ben-Gvir The time for decisive and meaningful action is now. The time to end the genocide is now. _________________________________________________________________________ _____ As of May 28 (2025), the humanitarian crisis in Gaza has reached shameful and apocalyptic levels: Israel has displaced 1.9 million people (about 90%) of the population, and destroyed 92% of housing structures.(3) Israel has killed over 54,000 Palestinians, and injured over 123,000 Palestinians.(4) This is likely a significant underestimate.(5,6) Even with conservative death estimates, Israel has killed at a rate in Gaza higher than any other 21st century conflict.(7) Children in Gaza are being killed by Israel at a rate higher than all other worldwide conflicts combined.(8) Israel has killed over 1400 health care workers, and targeted almost every hospital and primary healthcare clinic in Gaza.(9-11) Conservative estimates confirm that Israel’s policy of deliberate starvation (12) and withholding humanitarian aid has already killed dozens of children,(13) with thousands more at imminent risk of starvation. Israel has imprisoned thousands of Palestinian people in Israeli prisons, including hundreds of children.(14) This includes dozens of health care providers, held without any charges. As health care providers, we must uphold both the principles of humanity, and international humanitarian law. 1. We demand regional, national and international health authorities condemn Israel’s policy of deliberate starvation, withholding of humanitarian aid, and targeting of health care professionals and facilities. 2. We demand national governments respect and comply with the decisions of the International Criminal Court (ICC) and International Court of Justice (ICJ). This includes fulfilling the arrest warrants, and the dismantling of the illegal Israeli occupation. 3. We agree with the decisions of major human rights organizations, including Amnesty International, Human Rights Watch, and hundreds of genocide scholars, that Israel is committing genocide in Gaza. We insist that as part of the obligations laid out by the International Court of Justice ruling, that all … 4. We call for an immediate and full arms embargo, urgent and unrestricted humanitarian aid, immediate release of all civilian hostages (in Israel and Gaza), and an end to the illegal Israeli Occupation and apartheid. 5. We call for an international protective force in Gaza, with the involvement and consent of Palestine, to restore peace and to fulfill states’ obligations in protecting the Palestinian population from ongoing genocide. As a health care provider committed to the dignity and humanity of all people, including Palestinians, I demand you act now. Confronting genocide requires action, not words.
June 10, 2025 at 3:41 AM
catherineclase.bsky.social
We are obliged to speak out about genocide

Other healthworkers, join the #Pledge2EndGenocide #Pledge4Humanity

On June 10, share this post. Read the letter, sign the pledge

@mark-carney.bsky.social
Anita Anand

Sanction Israel now

docs.google.com/forms/d/e/1F...
A woman in a kuffiyeh hods a sign reading '#pledge4humanity #pledge2endgenocide - Mark Carney Anita Anand - Sanction Israel Now'
June 10, 2025 at 3:38 AM
catherineclase.bsky.social
@mark-carney.bsky.social follow through on your promise and sanction Israel now
June 9, 2025 at 3:17 AM
catherineclase.bsky.social
Wastewater sar-cov2 levels correlate with employee abscences and predict employee absences in the following week

We have the tools if only we would use them

academic.oup.com/jid...
A graph of employee absences and wastewater levels of SARS-CoV2 shows agreement and matching patterns
May 16, 2025 at 5:03 PM
catherineclase.bsky.social
Here is a useful, approximate, size guide for respirators from Canada Strong

canadastrong.ca/coll...
Approximate sizing for a range of Canadian-made masks, from the Can-99e as the smallest, suitable for children, to the Breathe-teq X-large for largest adults
May 7, 2025 at 8:06 PM
catherineclase.bsky.social
A screen shot of searching for emojis. Numerous emojis suggested for 'Christmas' A screen shot of searching for emojis. No suggestions at all for 'Eid'
March 30, 2025 at 7:53 PM
catherineclase.bsky.social
Excellent new clinical practice guideline for critical care

#Kidney community take note - it's OK to say 'no recommendation'

#Nephsky #askrenal

Melatonin may reduce the prevalence of delirium (RR, 0.70; 95% CI, 0.57–0.87; low certainty)

doi.org/10.1097/CCM....
Recommendations There is insufficient evidence to make a recommendation on the use of benzodiazepines to treat anxiety in adult patients admitted to the ICU We suggest using dexmedetomidine over propofol for sedation in mechanically ventilated adult patients admitted to the ICU where light sedation and/or a reduction in delirium are of highest priorities We are unable to issue a recommendation for or against the use of antipsychotics over usual care for the treatment of delirium in adult patients admitted to the ICU We are unable to issue a recommendation for or against the use of antipsychotics over usual care for the treatment of delirium in adult patients admitted to the ICU We suggest administering melatonin over no melatonin in adult patients admitted to the ICU
March 3, 2025 at 4:34 PM
catherineclase.bsky.social
Suggested classification from 2004, using the word 'Group' for the dimension of loss of clearance function and 'Proteinuria' for the dimension of increasing proteinuria

#nephsky #ItsCategoryNotStage

doi.org/10.1136/bmj....

4b/
A table from the 2004 paper discussed in the thread. A 10*6 table. Rows represent Groups, categorized by GFR and dialysis 1 ≥80 2 60-79 3 30-59 4 15-29 5* <15, not requiring renal replacement therapy 6* <15, renal replacement therapy offered but declined 7* <15, might benefit from renal replacement therapy but pursuing conservative treatment on medical advice 8* <15, requiring, but not receiving, renal replacement therapy because of resource constraints or lack of availability HD Haemodialysis PD Peritoneal dialysis Columns represent degree of proteinuria, in this 2024 example, characterized by dipstick
February 19, 2025 at 3:08 PM
catherineclase.bsky.social
@CBC @CBCNews it’s good that you are discussing the threat to Canadian sovereignty and democracy

But your headline normalizes a truly alarming situation

You need to name this and point out how unprecedented it is for one democracy to threaten another in this way
Black text on a white background reads: Trump is starting a trade war. If he wants to absorb Canada, what comes next will be worse.
February 2, 2025 at 7:39 PM