Marc Veldhoen
@marcveld.bsky.social
Professor of Immunology 🇳🇱 🇬🇧
Lisbon, 🇵🇹
#Immunology
Time for Science, not silence
https://scholar.google.co.uk/citations?user=7vG1jLIAAAAJ&hl=en
https://orcid.org/0000-0002-1478-9562
threads.net/@marc_veld
mastodon.online/@marc_veld
Lisbon, 🇵🇹
#Immunology
Time for Science, not silence
https://scholar.google.co.uk/citations?user=7vG1jLIAAAAJ&hl=en
https://orcid.org/0000-0002-1478-9562
threads.net/@marc_veld
mastodon.online/@marc_veld
Pinned
Marc Veldhoen
@marcveld.bsky.social
· Nov 29
What will population immunity to SARS-CoV-2 look like in a post-vaccine world?
An updated outlook (2025)
marcveldhoen.substack.com
Five years of COVID taught us one thing: immunology didn’t fail, our public discourse did. My new Substack cuts through the noise with evidence, not ideology. If you want facts over fear, and science over spin, join here:
marcveldhoen.substac...
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marcveldhoen.substac...
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Reposted by Marc Veldhoen
Why is it so difficult for a pathogen to escape our immune system?
We have many detector that recognise conserved parts of pathogens.
We have T and B cells that can virtually recognise specifically any patogen.
And we are different individually what we recognise.
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We have many detector that recognise conserved parts of pathogens.
We have T and B cells that can virtually recognise specifically any patogen.
And we are different individually what we recognise.
1/10
March 30, 2024 at 12:31 PM
Why is it so difficult for a pathogen to escape our immune system?
We have many detector that recognise conserved parts of pathogens.
We have T and B cells that can virtually recognise specifically any patogen.
And we are different individually what we recognise.
1/10
We have many detector that recognise conserved parts of pathogens.
We have T and B cells that can virtually recognise specifically any patogen.
And we are different individually what we recognise.
1/10
Reposted by Marc Veldhoen
Systematic analysis of COVID-19 mRNA vaccines using four orthogonal approaches demonstrates no excessive DNA impurities
DNAgate will continue, since it is based on pseudoscience and conspiracy. This paper corrects it only for those adhering to facts
www.nature.com/artic...
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DNAgate will continue, since it is based on pseudoscience and conspiracy. This paper corrects it only for those adhering to facts
www.nature.com/artic...
1/10
Systematic analysis of COVID-19 mRNA vaccines using four orthogonal approaches demonstrates no excessive DNA impurities
npj Vaccines - Systematic analysis of COVID-19 mRNA vaccines using four orthogonal approaches demonstrates no excessive DNA impurities
www.nature.com
December 23, 2025 at 3:22 PM
Systematic analysis of COVID-19 mRNA vaccines using four orthogonal approaches demonstrates no excessive DNA impurities
DNAgate will continue, since it is based on pseudoscience and conspiracy. This paper corrects it only for those adhering to facts
www.nature.com/artic...
1/10
DNAgate will continue, since it is based on pseudoscience and conspiracy. This paper corrects it only for those adhering to facts
www.nature.com/artic...
1/10
Reposted by Marc Veldhoen
New Substack: the myth that SARS-CoV-2 causes “premature ageing” of T cells.
I break down basic T-cell biology, telomeres, why acute-phase studies mislead — and what longitudinal data actually show.
open.substack.com/pu...
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I break down basic T-cell biology, telomeres, why acute-phase studies mislead — and what longitudinal data actually show.
open.substack.com/pu...
1/2
The myth of SARS-CoV-2-induced premature T cell ageing
A critical look at the evidence
open.substack.com
January 17, 2026 at 2:13 PM
New Substack: the myth that SARS-CoV-2 causes “premature ageing” of T cells.
I break down basic T-cell biology, telomeres, why acute-phase studies mislead — and what longitudinal data actually show.
open.substack.com/pu...
1/2
I break down basic T-cell biology, telomeres, why acute-phase studies mislead — and what longitudinal data actually show.
open.substack.com/pu...
1/2
National Cancer Institute studying ivermectin’s ‘ability to kill cancer cells,’ alarming career scientists
The NCI director didn’t cite new evidence that prompted the agency to look into it
www.statnews.com/202...
1/4
The NCI director didn’t cite new evidence that prompted the agency to look into it
www.statnews.com/202...
1/4
National Cancer Institute studying ivermectin’s ‘ability to kill cancer cells,’ alarming career scientists
The National Cancer Institute is studying ivermectin as a potential cancer treatment, according to its top official, alarming career scientists.
www.statnews.com
February 11, 2026 at 8:01 AM
National Cancer Institute studying ivermectin’s ‘ability to kill cancer cells,’ alarming career scientists
The NCI director didn’t cite new evidence that prompted the agency to look into it
www.statnews.com/202...
1/4
The NCI director didn’t cite new evidence that prompted the agency to look into it
www.statnews.com/202...
1/4
Reposted by Marc Veldhoen
Adult obesity and risk of severe infections: a multicohort study with global burden estimates
Adult obesity is a risk factor for infection-related hospitalisations and mortality across diverse pathogen types, causing ~1/10 infection-related deaths.
www.thelancet.com/jo...
1/6
Adult obesity is a risk factor for infection-related hospitalisations and mortality across diverse pathogen types, causing ~1/10 infection-related deaths.
www.thelancet.com/jo...
1/6
February 10, 2026 at 10:42 AM
Adult obesity and risk of severe infections: a multicohort study with global burden estimates
Adult obesity is a risk factor for infection-related hospitalisations and mortality across diverse pathogen types, causing ~1/10 infection-related deaths.
www.thelancet.com/jo...
1/6
Adult obesity is a risk factor for infection-related hospitalisations and mortality across diverse pathogen types, causing ~1/10 infection-related deaths.
www.thelancet.com/jo...
1/6
Reposted by Marc Veldhoen
How Scientific Funding Really Works
Why conspiracy narratives about “bought science” collapse under scrutiny
open.substack.com/pu...
2/2
Why conspiracy narratives about “bought science” collapse under scrutiny
open.substack.com/pu...
2/2
How Scientific Funding Really Works
Why conspiracy narratives about “bought science” collapse under scrutiny
open.substack.com
January 31, 2026 at 7:36 PM
How Scientific Funding Really Works
Why conspiracy narratives about “bought science” collapse under scrutiny
open.substack.com/pu...
2/2
Why conspiracy narratives about “bought science” collapse under scrutiny
open.substack.com/pu...
2/2
Reposted by Marc Veldhoen
This is "scaryfying" scientific findings.
Okay, this is the WP, you shouldn´t get your news from there.
"May" does an incredible amount of work here. Many things "may" and "can".
There is some data in this, mixed with hype.
1/10
Okay, this is the WP, you shouldn´t get your news from there.
"May" does an incredible amount of work here. Many things "may" and "can".
There is some data in this, mixed with hype.
1/10
February 10, 2026 at 11:37 PM
This is "scaryfying" scientific findings.
Okay, this is the WP, you shouldn´t get your news from there.
"May" does an incredible amount of work here. Many things "may" and "can".
There is some data in this, mixed with hype.
1/10
Okay, this is the WP, you shouldn´t get your news from there.
"May" does an incredible amount of work here. Many things "may" and "can".
There is some data in this, mixed with hype.
1/10
This is "scaryfying" scientific findings.
Okay, this is the WP, you shouldn´t get your news from there.
"May" does an incredible amount of work here. Many things "may" and "can".
There is some data in this, mixed with hype.
1/10
Okay, this is the WP, you shouldn´t get your news from there.
"May" does an incredible amount of work here. Many things "may" and "can".
There is some data in this, mixed with hype.
1/10
February 10, 2026 at 11:37 PM
This is "scaryfying" scientific findings.
Okay, this is the WP, you shouldn´t get your news from there.
"May" does an incredible amount of work here. Many things "may" and "can".
There is some data in this, mixed with hype.
1/10
Okay, this is the WP, you shouldn´t get your news from there.
"May" does an incredible amount of work here. Many things "may" and "can".
There is some data in this, mixed with hype.
1/10
Reposted by Marc Veldhoen
Science does not claim moral purity. It claims something more robust: procedures that work despite human imperfection. Those procedures are visible, documented, boring and unglamorous. Which is apparently why conspiracy narratives must make them sound sinister.
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January 31, 2026 at 7:35 PM
Science does not claim moral purity. It claims something more robust: procedures that work despite human imperfection. Those procedures are visible, documented, boring and unglamorous. Which is apparently why conspiracy narratives must make them sound sinister.
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Reposted by Marc Veldhoen
Ik dacht heel even: wie in Nederland gaat dit serieus nemen?
Een vodje, geen wetenschap maar fantasierijke speculatie gebaseerd op onzin, biologische onmogelijkheden en niet‑causale casestudies.
Het antwoord was eigenlijk al duidelijk.
1/2
Een vodje, geen wetenschap maar fantasierijke speculatie gebaseerd op onzin, biologische onmogelijkheden en niet‑causale casestudies.
Het antwoord was eigenlijk al duidelijk.
1/2
February 10, 2026 at 2:48 PM
Ik dacht heel even: wie in Nederland gaat dit serieus nemen?
Een vodje, geen wetenschap maar fantasierijke speculatie gebaseerd op onzin, biologische onmogelijkheden en niet‑causale casestudies.
Het antwoord was eigenlijk al duidelijk.
1/2
Een vodje, geen wetenschap maar fantasierijke speculatie gebaseerd op onzin, biologische onmogelijkheden en niet‑causale casestudies.
Het antwoord was eigenlijk al duidelijk.
1/2
Reposted by Marc Veldhoen
Vrijheid.
Het maken van een cartoon. Sarcasme, karikatuur, enz. Het aan de kaakstellen van mistanden.
Zoals deze van Joep Bertrams (Joep Bertrams). Het geeft de koers van de FvD aan die mensen toelaat met een dubieus extreem rechts verleden.
1/2
Het maken van een cartoon. Sarcasme, karikatuur, enz. Het aan de kaakstellen van mistanden.
Zoals deze van Joep Bertrams (Joep Bertrams). Het geeft de koers van de FvD aan die mensen toelaat met een dubieus extreem rechts verleden.
1/2
February 10, 2026 at 2:31 PM
Vrijheid.
Het maken van een cartoon. Sarcasme, karikatuur, enz. Het aan de kaakstellen van mistanden.
Zoals deze van Joep Bertrams (Joep Bertrams). Het geeft de koers van de FvD aan die mensen toelaat met een dubieus extreem rechts verleden.
1/2
Het maken van een cartoon. Sarcasme, karikatuur, enz. Het aan de kaakstellen van mistanden.
Zoals deze van Joep Bertrams (Joep Bertrams). Het geeft de koers van de FvD aan die mensen toelaat met een dubieus extreem rechts verleden.
1/2
Ik dacht heel even: wie in Nederland gaat dit serieus nemen?
Een vodje, geen wetenschap maar fantasierijke speculatie gebaseerd op onzin, biologische onmogelijkheden en niet‑causale casestudies.
Het antwoord was eigenlijk al duidelijk.
1/2
Een vodje, geen wetenschap maar fantasierijke speculatie gebaseerd op onzin, biologische onmogelijkheden en niet‑causale casestudies.
Het antwoord was eigenlijk al duidelijk.
1/2
February 10, 2026 at 2:48 PM
Ik dacht heel even: wie in Nederland gaat dit serieus nemen?
Een vodje, geen wetenschap maar fantasierijke speculatie gebaseerd op onzin, biologische onmogelijkheden en niet‑causale casestudies.
Het antwoord was eigenlijk al duidelijk.
1/2
Een vodje, geen wetenschap maar fantasierijke speculatie gebaseerd op onzin, biologische onmogelijkheden en niet‑causale casestudies.
Het antwoord was eigenlijk al duidelijk.
1/2
Reposted by Marc Veldhoen
Should one see?
First of all, getting a paper published is not just sending it, making a few changes, and moving on to the next one. It is frequent rejections, sometimes many times, delays, much more work to be done, and possibly rejection again. More experiments, etc.
1/5
First of all, getting a paper published is not just sending it, making a few changes, and moving on to the next one. It is frequent rejections, sometimes many times, delays, much more work to be done, and possibly rejection again. More experiments, etc.
1/5
February 9, 2026 at 3:10 PM
Should one see?
First of all, getting a paper published is not just sending it, making a few changes, and moving on to the next one. It is frequent rejections, sometimes many times, delays, much more work to be done, and possibly rejection again. More experiments, etc.
1/5
First of all, getting a paper published is not just sending it, making a few changes, and moving on to the next one. It is frequent rejections, sometimes many times, delays, much more work to be done, and possibly rejection again. More experiments, etc.
1/5
Vrijheid.
Het maken van een cartoon. Sarcasme, karikatuur, enz. Het aan de kaakstellen van mistanden.
Zoals deze van Joep Bertrams (Joep Bertrams). Het geeft de koers van de FvD aan die mensen toelaat met een dubieus extreem rechts verleden.
1/2
Het maken van een cartoon. Sarcasme, karikatuur, enz. Het aan de kaakstellen van mistanden.
Zoals deze van Joep Bertrams (Joep Bertrams). Het geeft de koers van de FvD aan die mensen toelaat met een dubieus extreem rechts verleden.
1/2
February 10, 2026 at 2:31 PM
Vrijheid.
Het maken van een cartoon. Sarcasme, karikatuur, enz. Het aan de kaakstellen van mistanden.
Zoals deze van Joep Bertrams (Joep Bertrams). Het geeft de koers van de FvD aan die mensen toelaat met een dubieus extreem rechts verleden.
1/2
Het maken van een cartoon. Sarcasme, karikatuur, enz. Het aan de kaakstellen van mistanden.
Zoals deze van Joep Bertrams (Joep Bertrams). Het geeft de koers van de FvD aan die mensen toelaat met een dubieus extreem rechts verleden.
1/2
Engineering chimeric antigen receptor CD4 T cells for Alzheimer’s disease
Using your own T cells, modified ton recognise one of the AD contributing factors; fibrillar forms of aggregated amyloid-β
www.pnas.org/doi/10....
1/3
Using your own T cells, modified ton recognise one of the AD contributing factors; fibrillar forms of aggregated amyloid-β
www.pnas.org/doi/10....
1/3
February 10, 2026 at 2:17 PM
Engineering chimeric antigen receptor CD4 T cells for Alzheimer’s disease
Using your own T cells, modified ton recognise one of the AD contributing factors; fibrillar forms of aggregated amyloid-β
www.pnas.org/doi/10....
1/3
Using your own T cells, modified ton recognise one of the AD contributing factors; fibrillar forms of aggregated amyloid-β
www.pnas.org/doi/10....
1/3
Adult obesity and risk of severe infections: a multicohort study with global burden estimates
Adult obesity is a risk factor for infection-related hospitalisations and mortality across diverse pathogen types, causing ~1/10 infection-related deaths.
www.thelancet.com/jo...
1/6
Adult obesity is a risk factor for infection-related hospitalisations and mortality across diverse pathogen types, causing ~1/10 infection-related deaths.
www.thelancet.com/jo...
1/6
February 10, 2026 at 10:42 AM
Adult obesity and risk of severe infections: a multicohort study with global burden estimates
Adult obesity is a risk factor for infection-related hospitalisations and mortality across diverse pathogen types, causing ~1/10 infection-related deaths.
www.thelancet.com/jo...
1/6
Adult obesity is a risk factor for infection-related hospitalisations and mortality across diverse pathogen types, causing ~1/10 infection-related deaths.
www.thelancet.com/jo...
1/6
Reposted by Marc Veldhoen
The Children of Dilley
ProPublica went inside the immigrant detention center for families in Dilley, Texas. Children held there told us about the anguish of being ripped from their lives in the United States and the fear of what comes next.
www.propublica.org/a...
1/2
ProPublica went inside the immigrant detention center for families in Dilley, Texas. Children held there told us about the anguish of being ripped from their lives in the United States and the fear of what comes next.
www.propublica.org/a...
1/2
The Kids Trump Sent to ICE’s Dilley Detention Center
ProPublica went inside the immigrant detention center for families in Dilley, Texas. Children held there told us about the anguish of being ripped from their lives in the United States and the fear of what comes next.
www.propublica.org
February 9, 2026 at 4:10 PM
The Children of Dilley
ProPublica went inside the immigrant detention center for families in Dilley, Texas. Children held there told us about the anguish of being ripped from their lives in the United States and the fear of what comes next.
www.propublica.org/a...
1/2
ProPublica went inside the immigrant detention center for families in Dilley, Texas. Children held there told us about the anguish of being ripped from their lives in the United States and the fear of what comes next.
www.propublica.org/a...
1/2
Reposted by Marc Veldhoen
‘Absolute hell’: Irishman with valid US work permit held by Ice since September
Seamus Culleton has been in a detention facility in Texas for nearly five months despite having no criminal record.
It can happen to anyone.
www.irishtimes.com/w...
1/3
Seamus Culleton has been in a detention facility in Texas for nearly five months despite having no criminal record.
It can happen to anyone.
www.irishtimes.com/w...
1/3
‘Absolute hell’: Irishman with valid US work permit held by Ice since September
Seamus Culleton has been in a detention facility in Texas for nearly five months despite having no criminal record
www.irishtimes.com
February 9, 2026 at 4:05 PM
‘Absolute hell’: Irishman with valid US work permit held by Ice since September
Seamus Culleton has been in a detention facility in Texas for nearly five months despite having no criminal record.
It can happen to anyone.
www.irishtimes.com/w...
1/3
Seamus Culleton has been in a detention facility in Texas for nearly five months despite having no criminal record.
It can happen to anyone.
www.irishtimes.com/w...
1/3
The Children of Dilley
ProPublica went inside the immigrant detention center for families in Dilley, Texas. Children held there told us about the anguish of being ripped from their lives in the United States and the fear of what comes next.
www.propublica.org/a...
1/2
ProPublica went inside the immigrant detention center for families in Dilley, Texas. Children held there told us about the anguish of being ripped from their lives in the United States and the fear of what comes next.
www.propublica.org/a...
1/2
The Kids Trump Sent to ICE’s Dilley Detention Center
ProPublica went inside the immigrant detention center for families in Dilley, Texas. Children held there told us about the anguish of being ripped from their lives in the United States and the fear of what comes next.
www.propublica.org
February 9, 2026 at 4:10 PM
The Children of Dilley
ProPublica went inside the immigrant detention center for families in Dilley, Texas. Children held there told us about the anguish of being ripped from their lives in the United States and the fear of what comes next.
www.propublica.org/a...
1/2
ProPublica went inside the immigrant detention center for families in Dilley, Texas. Children held there told us about the anguish of being ripped from their lives in the United States and the fear of what comes next.
www.propublica.org/a...
1/2
‘Absolute hell’: Irishman with valid US work permit held by Ice since September
Seamus Culleton has been in a detention facility in Texas for nearly five months despite having no criminal record.
It can happen to anyone.
www.irishtimes.com/w...
1/3
Seamus Culleton has been in a detention facility in Texas for nearly five months despite having no criminal record.
It can happen to anyone.
www.irishtimes.com/w...
1/3
‘Absolute hell’: Irishman with valid US work permit held by Ice since September
Seamus Culleton has been in a detention facility in Texas for nearly five months despite having no criminal record
www.irishtimes.com
February 9, 2026 at 4:05 PM
‘Absolute hell’: Irishman with valid US work permit held by Ice since September
Seamus Culleton has been in a detention facility in Texas for nearly five months despite having no criminal record.
It can happen to anyone.
www.irishtimes.com/w...
1/3
Seamus Culleton has been in a detention facility in Texas for nearly five months despite having no criminal record.
It can happen to anyone.
www.irishtimes.com/w...
1/3
Should one see?
First of all, getting a paper published is not just sending it, making a few changes, and moving on to the next one. It is frequent rejections, sometimes many times, delays, much more work to be done, and possibly rejection again. More experiments, etc.
1/5
First of all, getting a paper published is not just sending it, making a few changes, and moving on to the next one. It is frequent rejections, sometimes many times, delays, much more work to be done, and possibly rejection again. More experiments, etc.
1/5
February 9, 2026 at 3:10 PM
Should one see?
First of all, getting a paper published is not just sending it, making a few changes, and moving on to the next one. It is frequent rejections, sometimes many times, delays, much more work to be done, and possibly rejection again. More experiments, etc.
1/5
First of all, getting a paper published is not just sending it, making a few changes, and moving on to the next one. It is frequent rejections, sometimes many times, delays, much more work to be done, and possibly rejection again. More experiments, etc.
1/5
Reposted by Marc Veldhoen
"Hate brings views": Confessions of a London fake news TikToker
Who are the real people behind the accounts spreading fury about the capital online? And what motivates them?
🤑
www.londoncentric.me...
1/3
Who are the real people behind the accounts spreading fury about the capital online? And what motivates them?
🤑
www.londoncentric.me...
1/3
"Hate brings views": Confessions of a London fake news TikToker
Who are the real people behind the accounts spreading fury about the capital online? And what motivates them?
www.londoncentric.media
February 8, 2026 at 3:45 PM
"Hate brings views": Confessions of a London fake news TikToker
Who are the real people behind the accounts spreading fury about the capital online? And what motivates them?
🤑
www.londoncentric.me...
1/3
Who are the real people behind the accounts spreading fury about the capital online? And what motivates them?
🤑
www.londoncentric.me...
1/3
The EU is lagging behind the US and China; fact.
But, is the problem the EC? Rules and regulations are passed by the EU parliament.
The real stuggle seems at nation level, where governments prioritise their share of the pie and inherited local situations, over collective progress and change.
But, is the problem the EC? Rules and regulations are passed by the EU parliament.
The real stuggle seems at nation level, where governments prioritise their share of the pie and inherited local situations, over collective progress and change.
EU countries are piling pressure on the European Commission to get serious about turning around the bloc’s sluggish economy, amid fears it could be left at the mercy of other big players like the U.S. and China.
Brussels Playbook has more 👇
Brussels Playbook has more 👇
Time to grow up
Presented by European Commission’s Directorate-General for Employment, Social Affairs and Inclusion By GABRIEL GAVIN PRESENTED BY Send tips here | Contact us on X @gerardofortuna @NicholasVinocur |…
www.politico.eu
February 9, 2026 at 11:43 AM
The EU is lagging behind the US and China; fact.
But, is the problem the EC? Rules and regulations are passed by the EU parliament.
The real stuggle seems at nation level, where governments prioritise their share of the pie and inherited local situations, over collective progress and change.
But, is the problem the EC? Rules and regulations are passed by the EU parliament.
The real stuggle seems at nation level, where governments prioritise their share of the pie and inherited local situations, over collective progress and change.
Framing at work again.
The president is now attacking a US Olympian as a “Loser” and misrepresenting his words for his mild unspecified criticisms about things going on in the US right now.
February 9, 2026 at 11:02 AM
Framing at work again.
Reposted by Marc Veldhoen
A non-peer-reviewed preprint by non-experts is not evidence. It’s an opinion, with scientific words and references. Anyone can upload speculation to a preprint server. Amplifying it to the public as “cancer risk” is irresponsible fear-mongering, not science!
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February 8, 2026 at 9:02 PM
A non-peer-reviewed preprint by non-experts is not evidence. It’s an opinion, with scientific words and references. Anyone can upload speculation to a preprint server. Amplifying it to the public as “cancer risk” is irresponsible fear-mongering, not science!
1/4
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