Dr. Jen Irwin

Dr. Jen Irwin

@drjenirwin.bsky.social

Professor, Health Promotion, views are my own. Evidence-informed decision-making is important. Integrity matters. N95 wearer. Dog mom. (She/her) 🇨🇦

10,555 Followers 744 Following 618 Posts Joined Oct 2023
2 days ago

Bottom line from the last 6 years of COVID research : If you’ve got blood vessels, you’d be wise to avoid additional infections.

Now is a great time to normalize wearing a respirator. Might feel awkward at first, but every person who does makes it easier for others to follow. Be a leader. 😷

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3 days ago

The description of participants provides this info

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3 days ago
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Universities Are Failing a Critical COVID Test | The Tyee Post-COVID condition is a real but preventable lasting threat. Why aren’t schools taking it seriously?

💯

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3 days ago
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COVID-19 may Enduringly Impact Cognitive Performance and Brain Haemodynamics in Undergraduate Students To date, 770 million people worldwide have contracted COVID-19, with many reporting long-term “brain fog”. Concerningly, young adults are both overrep…

We cannot stay silent about this as to do so is to be complicit in the illogical & amoral approach of facilitating brain damage as part of the learning experience.

“37 % of the undergraduates exhibited impaired cognition up to 17 months post-infection.”

www.sciencedirect.com/science/arti...

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4 days ago

I’m so sorry - this is unconscionable behaviour and no doubt added to the stress of an already stressful situation. I’m hope your surgery went well and you managed to avoid infections of any kind.

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4 days ago
Screenshot of a news article from The Post titled “Repeatedly getting Covid doesn’t build immunity, ‘it’s more like accumulating damage’,” written by Melanie Earley of RNZ and dated March 10, 2026. Below the headline is a portrait of leading vaccinologist and associate professor Dr Helen Petousis-Harris, shown facing the camera against a dark background. The article discusses how repeated COVID-19 infections may cause cumulative harm rather than building lasting immunity.

"Leading vaccinologist Helen Petousis-Harris says there's not enough awareness of the impact of COVID-19 on overall health."

"What many people don't realise is that getting COVID repeatedly is not like building immunity, it's more like accumulating damage," she says.

Source: archive.md/Qsv13

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5 days ago

🤯 I miss logic so much.

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5 days ago
National Advisory Committee on Preventive Health Services - Canada.ca About the National Advisory Committee on Preventive Health Services

Well, the structure of the body that will control the interpretation of science related to screening and preventative health services is out, and it reflects the power-grubbing mentality we've come to expect from institutional medicine.

Note that the priority is to guarantee majority power to...

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5 days ago

I value empathy & I’m finding it challenging currently…with all the research we now have access to, thinking ahead 15 or 20yrs, what are science-literate people planning to tell their kids…sorry about your lifetime of illness, but people made fun so we went maskless?! Sorry for the snark.

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5 days ago

I’m so sorry this has happened to you. You deserve better. Much better.

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5 days ago
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Persistent attenuation of lymphocyte subsets after mass SARS-CoV-2 infection Growing evidence suggests that lymphocyte subsets are declined in COVID-19 patients, but it is unclear if these alterations persist after widespread e…

“Our findings redefine SARS-CoV-2 infection as a condition of long-lasting immune compromise.”

At this point, I genuinely have no ability to comprehend how is anyone not scared sh*t-less about the long-term consequences of infections, especially on kids?

www.sciencedirect.com/science/arti...

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6 days ago

Yes, endemic is not benign. And, when it comes to covid, I cannot align the current situation with any definitions of endemic…by my read, it maintains the characteristics of being pandemic.

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1 week ago
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Babies with COVID-19 develop more serious disease than those with RSV, US data reveal

www.cidrap.umn.edu/covid-19/bab...

😒🤦🏻‍♀️

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6 days ago
Teal graphic with the white whn.global logo at the top. Large centered text reads: “Long COVID is a growing public health crisis.” Smaller centered text below reads: “Millions of people are living with lasting health impacts after COVID infections — affecting their ability to work, study, care for families, and participate fully in daily life.” At the bottom: “World Health Network - Science for a safer, healthier world.” Teal graphic with the white whn.global logo at the top. Large centered text reads: “This March, during Long COVID Awareness Month, we commit to making this crisis visible.” Smaller centered text below reads: “Awareness leads to research. Research leads to solutions. Solutions start with attention. If you believe Long COVID deserves urgent public health focus, share this post.” At the bottom: “World Health Network - Science for a safer, healthier world.”

Millions of people around the world are living with the lasting impacts of Long COVID — a growing public health crisis that continues long after the initial infection.

Long COVID can affect the brain, heart, lungs, immune system, and more, (...)

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1 week ago
A graph with white and light grey striped background showing levels of COVID-19, RSV, FLU A, and FLU B levels for Ontario

Wastewater levels for Ontario, released today, March 6th, 2026…otherwise known as “during COVID”

wwater.ca/Ontario

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1 week ago
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A medical journal says the case reports it has published for 25 years are, in fact, fiction A Canadian journal has issued corrections on 138 case reports it published over the last 25 years to add a disclaimer: The cases described are fictional. Paediatrics & Child Health, the journal…

Ummmm….

retractionwatch.com/2026/03/03/c...

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1 week ago

~ 1 in 99 Canadians is currently infected with COVID

+

~ Half a million studies underscore importance of avoiding COVID for short- & long-term serious health problems

=

Don’t let anyone discourage your protection practices - they will not be the ones to take care of you if you get LC. 😷 💉 🪟💨

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1 week ago

~1 in 99 people in Canada are currently infected, 1 in 82 in Ontario, 1 in 51 in Manitoba…that’s ~8x higher than the lowest points of the pandemic.

“During COVID is NOW”

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1 week ago
This image shows gauges with the Feb 28 - Mar 13, 2026 COVID Forecast scores for Canada, the provinces, and territories. From left to right:

Canada: HIGH - 6.7
Alberta: HIGH - 6.5
British Columbia: MODERATE - 4.4
Manitoba: VERY HIGH - 10.0
New Brunswick: HIGH - 7.1
Newfoundland & Labrador: MODERATE - 4.7
North: HIGH - 6.7
Nova Scotia: HIGH - 6.0
Ontario: HIGH - 7.7
Prince Edward Island: MODERATE - 4.9
Quebec: HIGH - 6.6
Saskatchewan: HIGH - 8.1

A text box reads: 'The COVID Forecast is calculated from 3 equally weighted categories: 1) Current infections and spread; 2) Healthcare system impact; 3) Mortality. Within each category there is one sub-category for trends over the most recent week (Trends) and one sub-category for current parameter values relative to a specified baseline (Current values). Trends and current values are weighted equally when determining the final score for a category. All Forecast input data and sources are available here (https://datastudio.google.com/embed/u/0/reporting/42b886cf-d661-488e-b7d8-5c5836b55ab6/page/p_2yqs028mwc). Past Forecast scores are available in the table below. Forecast scores are grouped into 4 ranges: MODERATE (1 to <5, white), HIGH (6 to <10, yellow), VERY HIGH (10 to <15, orange), SEVERE (>15 red).'

Canadian COVID Forecast: Feb 28 - Mar 13, 2026

SEVERE: none
VERY HIGH: MB
HIGH: CAN, AB, NB, North, NS, ON, QC, SK
MODERATE: BC, NL, PEI

About 1 in 99 people in Canada are CURRENTLY infected.

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1 week ago

Would really appreciate it if a greater percentage of people liking and replying in agreement to this take (which is correct) were still masking, getting boosted, and otherwise engaging in any level of covid mitigation. The virus is very much still around and still causing harm.

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1 week ago
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LitCovid LitCovid is a curated literature hub for tracking up-to-date scientific information about the 2019 novel Coronavirus.

And more than 20,000 published papers on #LongCOVID, which is still without a cure -

www.ncbi.nlm.nih.gov/research/cor...

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1 week ago
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LitCovid LitCovid is a curated literature hub for tracking up-to-date scientific information about the 2019 novel Coronavirus.

If you need a reason to do whatever you can to avoid COVID, here’s about a half million of them…take your pick.

www.ncbi.nlm.nih.gov/research/cor...

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2 weeks ago
Graph with white and grey horizon stripes as background, showing Ontario rates over time of several pathogens including covid-19 and RSV Graph with white and grey horizontal stripes as background showing rates over time of several pathogens including covid-19 and RSV, specific to Toronto Ontario

“During COVID” (and other respiratory transmitted infections) would be now.

Wastewater released today for Ontario. Screen shots of Ontario in general and Toronto specifically. wwater.ca/Ontario

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2 weeks ago
The risk of kidney disease increases following SARS-CoV-2 infection compared to influenza - Communications Medicine Zhang et al. utilized a large real-world dataset from more than three million adults in the United States to compare the incident of kidney disease risks following COVID-19 and influenza infections. T...

www.nature.com/articles/s43...

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2 weeks ago
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So someone with measles can spread it before they have symptoms, it can float in the air for hours and years later, they can develop new health complications?

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2 weeks ago
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Los Angeles recognizes Long COVID Awareness Day - The Sick Times Local advocates pushed America’s second largest city to formally observe the day on March 15.

Here's the official story:

thesicktimes.org/2026/02/25/l...

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2 weeks ago

I can’t breach confidentiality… but I think I can say this much.

I am blown away by the change I am seeing in people’s health in the clinical setting… since C19. It’s not subtle. It’s like one of those paintings with every bright colour thrown on it.

It is very sad.

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2 weeks ago

The absolute BEST public health comms…if you’re not already following @durhamhealthnc.bsky.social , I strongly recommend doing so. They even post science-backed messaging on FB!! That’s integrity!!

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2 weeks ago
PMC report for Feb 23, 2026

Heat map showing CDC levels by state
PMC estimates of 1 in 58 people actively infectious (1.7% of the population) and 850,000 new daily infections.

PMC COVlD Report (2/23/26): Transmission has increased in the South, while stable across much of the U.S.

Using harmonized wastewater data, we project...
✴️18 states with High/Very High levels
✴️1 in 58 Americans actively infectious
✴️850,000 new daily infections

Link: pmc19.com/data
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2 weeks ago
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Long Covid ruled as occupational disease in nurses - Switzerland Long Covid confirmed as an occupational disease in nurses.

Long Covid ruled as occupational disease in nurses

https://www.europesays.com/ch/17407/

Long Covid confirmed as an occupational disease in nurses. Keystone-SDA Baloise Insurance must recognise the Long Covid disease…

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