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
If you don´t test, you can pretend it does not exist....
Gallup will no longer measure presidential approval after 88 years
Trump’s Gallup approval rating as of last December was among the lowest the organization had found since it began in the 1930s.
thehill.com/homenews...
Gallup will no longer measure presidential approval after 88 years
Trump’s Gallup approval rating as of last December was among the lowest the organization had found since it began in the 1930s.
thehill.com/homenews...
February 11, 2026 at 10:31 PM
If you don´t test, you can pretend it does not exist....
Gallup will no longer measure presidential approval after 88 years
Trump’s Gallup approval rating as of last December was among the lowest the organization had found since it began in the 1930s.
thehill.com/homenews...
Gallup will no longer measure presidential approval after 88 years
Trump’s Gallup approval rating as of last December was among the lowest the organization had found since it began in the 1930s.
thehill.com/homenews...
Freedom ...
NEW: “CBS Evening News” producer Alicia Hastey sends a bombshell farewell note:
Stories are “evaluated not just on their journalistic merit but on whether they conform to a shifting set of ideological expectations.”
Stories are “evaluated not just on their journalistic merit but on whether they conform to a shifting set of ideological expectations.”
February 12, 2026 at 1:27 PM
Freedom ...
Reposted by Marc Veldhoen
NBC news picture, perfectly showing the smug hautaine disdain of the US government towards the victims of Epstein. One for the history books
The victims raised their hand to show they had not been asked to meet with the DoJ.
The victims raised their hand to show they had not been asked to meet with the DoJ.
February 11, 2026 at 10:43 PM
NBC news picture, perfectly showing the smug hautaine disdain of the US government towards the victims of Epstein. One for the history books
The victims raised their hand to show they had not been asked to meet with the DoJ.
The victims raised their hand to show they had not been asked to meet with the DoJ.
Reposted by Marc Veldhoen
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
More of those Brexit benefits; isolated on the world trade stage.
UK has two months to save its steel industry, says Tata exec
U.K. urged to follow the EU in imposing higher tariffs on imported products.
UK has two months to save its steel industry, says Tata exec
U.K. urged to follow the EU in imposing higher tariffs on imported products.
UK has two months to save its steel industry, says Tata exec
U.K. urged to follow the EU in imposing higher tariffs on imported products.
www.politico.eu
February 11, 2026 at 10:46 PM
More of those Brexit benefits; isolated on the world trade stage.
UK has two months to save its steel industry, says Tata exec
U.K. urged to follow the EU in imposing higher tariffs on imported products.
UK has two months to save its steel industry, says Tata exec
U.K. urged to follow the EU in imposing higher tariffs on imported products.
More of those Brexit benefits; isolated on the world trade stage.
UK has two months to save its steel industry, says Tata exec
U.K. urged to follow the EU in imposing higher tariffs on imported products.
UK has two months to save its steel industry, says Tata exec
U.K. urged to follow the EU in imposing higher tariffs on imported products.
UK has two months to save its steel industry, says Tata exec
U.K. urged to follow the EU in imposing higher tariffs on imported products.
www.politico.eu
February 11, 2026 at 10:46 PM
More of those Brexit benefits; isolated on the world trade stage.
UK has two months to save its steel industry, says Tata exec
U.K. urged to follow the EU in imposing higher tariffs on imported products.
UK has two months to save its steel industry, says Tata exec
U.K. urged to follow the EU in imposing higher tariffs on imported products.
NBC news picture, perfectly showing the smug hautaine disdain of the US government towards the victims of Epstein. One for the history books
The victims raised their hand to show they had not been asked to meet with the DoJ.
The victims raised their hand to show they had not been asked to meet with the DoJ.
February 11, 2026 at 10:43 PM
NBC news picture, perfectly showing the smug hautaine disdain of the US government towards the victims of Epstein. One for the history books
The victims raised their hand to show they had not been asked to meet with the DoJ.
The victims raised their hand to show they had not been asked to meet with the DoJ.
If you don´t test, you can pretend it does not exist....
Gallup will no longer measure presidential approval after 88 years
Trump’s Gallup approval rating as of last December was among the lowest the organization had found since it began in the 1930s.
thehill.com/homenews...
Gallup will no longer measure presidential approval after 88 years
Trump’s Gallup approval rating as of last December was among the lowest the organization had found since it began in the 1930s.
thehill.com/homenews...
February 11, 2026 at 10:31 PM
If you don´t test, you can pretend it does not exist....
Gallup will no longer measure presidential approval after 88 years
Trump’s Gallup approval rating as of last December was among the lowest the organization had found since it began in the 1930s.
thehill.com/homenews...
Gallup will no longer measure presidential approval after 88 years
Trump’s Gallup approval rating as of last December was among the lowest the organization had found since it began in the 1930s.
thehill.com/homenews...
Reposted by Marc Veldhoen
Jayapal asks Epstein survivors in hearing room to stand and raise hands if they still haven't been able to meet with Bondi's DOJ. Every single one of them doe. Jayapal then gives Bondi an opportunity to apologize. She responds by trying to attack Jayapal and Merrick Garland but doesn't apologize.
February 11, 2026 at 3:49 PM
Jayapal asks Epstein survivors in hearing room to stand and raise hands if they still haven't been able to meet with Bondi's DOJ. Every single one of them doe. Jayapal then gives Bondi an opportunity to apologize. She responds by trying to attack Jayapal and Merrick Garland but doesn't apologize.
It is official, a flu-epidemic status in the Netherlands. Although there seemed a possible reduction 2 weeks ago, the level has increased. Based on UK data, it should not be an extremely heavy flu year. Hwoever, it will affect many people. Try and reduce transmission.
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February 11, 2026 at 3:15 PM
It is official, a flu-epidemic status in the Netherlands. Although there seemed a possible reduction 2 weeks ago, the level has increased. Based on UK data, it should not be an extremely heavy flu year. Hwoever, it will affect many people. Try and reduce transmission.
1/3
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Another study, confirming this important message:
Recombinant zoster vaccine is associated with a reduced risk of dementia
www.nature.com/artic...
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Recombinant zoster vaccine is associated with a reduced risk of dementia
www.nature.com/artic...
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Recombinant zoster vaccine is associated with a reduced risk of dementia | Nature Communications
Vaccines to prevent herpes zoster have been associated with reduced dementia risk. We conducted a retrospective matched cohort study of Kaiser Permanente Southern California members aged ≥65 years who received two doses of RZV 4 weeks–6 months apart between 01 April 2018 and 31 December 2020, with no dementia diagnoses or dementia medications prior to or within 6 months of their second RZV dose. Cox regression with inverse probability of treatment weighting was used to estimate adjusted hazard ratios (aHRs). The study included 65,800 RZV-vaccinated individuals and 263,200 unvaccinated matches. Vaccination with two doses of RZV was associated with a 51% lower risk of dementia (aHR: 0.49 [95% confidence interval (CI): 0.46–0.51]); aHRs were comparable across age, and racial and ethnic groups, but the risk reduction was stronger in females compared to males. In an evaluation of potential healthy vaccinee bias, the aHR of dementia for RZV compared to Tdap was 0.73 (95% CI: 0.67–0.79). Vaccination with two doses of RZV is associated with a statistically significant reduction in the risk of dementia in adults aged ≥65 years. After accounting for healthy vaccinee bias, RZV vaccination remains associated with a statistically significant lower risk of dementia. The study shows that vaccination with two doses of recombinant zoster vaccine is associated with a 51% reduction in the risk of dementia in adults aged ≥65 years. Reduction in risk is comparable across subgroups and remains statistically significant after accounting for healthy vaccinee bias.
www.nature.com
February 11, 2026 at 2:57 PM
Another study, confirming this important message:
Recombinant zoster vaccine is associated with a reduced risk of dementia
www.nature.com/artic...
1/5
Recombinant zoster vaccine is associated with a reduced risk of dementia
www.nature.com/artic...
1/5
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...
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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...
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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.
1/2
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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