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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Keep asking after the facts. That is all: ask for the facts, what do they mean and in which context.
Trump nominated a legit white nationalist to a top post at the State Department. I asked him some basic questions about his belief in the “erasure of white culture”. Watch this embarrassing, fumbling answer. Like he has never before been asked to explain his views.
February 13, 2026 at 2:26 PM
Keep asking after the facts. That is all: ask for the facts, what do they mean and in which context.
The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command.
Leavitt: "Homan was able to achieve a level of cooperation w/local police to arrest left-wing agitators when they engage in unlawful behavior, which has led to a calmer situation. You are no longer seeing videos of them breaking up ICE operations are continuing. Nothing will stop President Trump."
February 13, 2026 at 2:22 PM
The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command.
Reposted by Marc Veldhoen
The US administration is going to kill its people while they cheer.
In January, Moderna’s announced the company will no longer invest in new Phase 3 vaccine trials for infectious diseases: “You cannot make a return on investment if you don’t have access to the U.S. market.”
1/4
In January, Moderna’s announced the company will no longer invest in new Phase 3 vaccine trials for infectious diseases: “You cannot make a return on investment if you don’t have access to the U.S. market.”
1/4
February 13, 2026 at 11:26 AM
The US administration is going to kill its people while they cheer.
In January, Moderna’s announced the company will no longer invest in new Phase 3 vaccine trials for infectious diseases: “You cannot make a return on investment if you don’t have access to the U.S. market.”
1/4
In January, Moderna’s announced the company will no longer invest in new Phase 3 vaccine trials for infectious diseases: “You cannot make a return on investment if you don’t have access to the U.S. market.”
1/4
The US administration is going to kill its people while they cheer.
In January, Moderna’s announced the company will no longer invest in new Phase 3 vaccine trials for infectious diseases: “You cannot make a return on investment if you don’t have access to the U.S. market.”
1/4
In January, Moderna’s announced the company will no longer invest in new Phase 3 vaccine trials for infectious diseases: “You cannot make a return on investment if you don’t have access to the U.S. market.”
1/4
February 13, 2026 at 11:26 AM
The US administration is going to kill its people while they cheer.
In January, Moderna’s announced the company will no longer invest in new Phase 3 vaccine trials for infectious diseases: “You cannot make a return on investment if you don’t have access to the U.S. market.”
1/4
In January, Moderna’s announced the company will no longer invest in new Phase 3 vaccine trials for infectious diseases: “You cannot make a return on investment if you don’t have access to the U.S. market.”
1/4
Reposted by Marc Veldhoen
Freedom
Ideology over reality and science
FDA declines to review Moderna application for new flu vaccine
Moderna requests meeting to discuss refusal as decision could have implications for all new and updated vaccines
www.theguardian.com/...
1/2
Ideology over reality and science
FDA declines to review Moderna application for new flu vaccine
Moderna requests meeting to discuss refusal as decision could have implications for all new and updated vaccines
www.theguardian.com/...
1/2
FDA declines to review Moderna application for new flu vaccine
Moderna requests meeting to discuss refusal as decision could have implications for all new and updated vaccines
www.theguardian.com
February 12, 2026 at 8:08 PM
Freedom
Ideology over reality and science
FDA declines to review Moderna application for new flu vaccine
Moderna requests meeting to discuss refusal as decision could have implications for all new and updated vaccines
www.theguardian.com/...
1/2
Ideology over reality and science
FDA declines to review Moderna application for new flu vaccine
Moderna requests meeting to discuss refusal as decision could have implications for all new and updated vaccines
www.theguardian.com/...
1/2
Reposted by Marc Veldhoen
Persistent T cell activation and cytotoxicity against glioblastoma following single oncolytic virus treatment in a clinical trial
Using a virus to cause danger signals in tumours to initiate a strong anti-tumour response.
www.cell.com/cell/ab...
1/5
Using a virus to cause danger signals in tumours to initiate a strong anti-tumour response.
www.cell.com/cell/ab...
1/5
February 12, 2026 at 9:38 PM
Persistent T cell activation and cytotoxicity against glioblastoma following single oncolytic virus treatment in a clinical trial
Using a virus to cause danger signals in tumours to initiate a strong anti-tumour response.
www.cell.com/cell/ab...
1/5
Using a virus to cause danger signals in tumours to initiate a strong anti-tumour response.
www.cell.com/cell/ab...
1/5
Reposted by Marc Veldhoen
Can't they lie better? February 12th, 2026.....
Anyone smart would read past the scare highlight.
And they would find out .....
1/2
Anyone smart would read past the scare highlight.
And they would find out .....
1/2
February 12, 2026 at 6:57 PM
Can't they lie better? February 12th, 2026.....
Anyone smart would read past the scare highlight.
And they would find out .....
1/2
Anyone smart would read past the scare highlight.
And they would find out .....
1/2
Ach, kijk, do de mus is ook nog actief en kan het liegen en framen niet laten. Net als antivax en COVIDdoom zijn dit soort anonieme laffaards alleen ophef aan het schoppen. Lezen en begrijpen kunnen ze niet.
"Wees voorzichtig met grafieken; ze kunnen makkelijk lijken, maar zijn vaak complexer."
"Wees voorzichtig met grafieken; ze kunnen makkelijk lijken, maar zijn vaak complexer."
February 12, 2026 at 11:31 PM
Ach, kijk, do de mus is ook nog actief en kan het liegen en framen niet laten. Net als antivax en COVIDdoom zijn dit soort anonieme laffaards alleen ophef aan het schoppen. Lezen en begrijpen kunnen ze niet.
"Wees voorzichtig met grafieken; ze kunnen makkelijk lijken, maar zijn vaak complexer."
"Wees voorzichtig met grafieken; ze kunnen makkelijk lijken, maar zijn vaak complexer."
Persistent T cell activation and cytotoxicity against glioblastoma following single oncolytic virus treatment in a clinical trial
Using a virus to cause danger signals in tumours to initiate a strong anti-tumour response.
www.cell.com/cell/ab...
1/5
Using a virus to cause danger signals in tumours to initiate a strong anti-tumour response.
www.cell.com/cell/ab...
1/5
February 12, 2026 at 9:38 PM
Persistent T cell activation and cytotoxicity against glioblastoma following single oncolytic virus treatment in a clinical trial
Using a virus to cause danger signals in tumours to initiate a strong anti-tumour response.
www.cell.com/cell/ab...
1/5
Using a virus to cause danger signals in tumours to initiate a strong anti-tumour response.
www.cell.com/cell/ab...
1/5
Freedom
Ideology over reality and science
FDA declines to review Moderna application for new flu vaccine
Moderna requests meeting to discuss refusal as decision could have implications for all new and updated vaccines
www.theguardian.com/...
1/2
Ideology over reality and science
FDA declines to review Moderna application for new flu vaccine
Moderna requests meeting to discuss refusal as decision could have implications for all new and updated vaccines
www.theguardian.com/...
1/2
FDA declines to review Moderna application for new flu vaccine
Moderna requests meeting to discuss refusal as decision could have implications for all new and updated vaccines
www.theguardian.com
February 12, 2026 at 8:08 PM
Freedom
Ideology over reality and science
FDA declines to review Moderna application for new flu vaccine
Moderna requests meeting to discuss refusal as decision could have implications for all new and updated vaccines
www.theguardian.com/...
1/2
Ideology over reality and science
FDA declines to review Moderna application for new flu vaccine
Moderna requests meeting to discuss refusal as decision could have implications for all new and updated vaccines
www.theguardian.com/...
1/2
Can't they lie better? February 12th, 2026.....
Anyone smart would read past the scare highlight.
And they would find out .....
1/2
Anyone smart would read past the scare highlight.
And they would find out .....
1/2
February 12, 2026 at 6:57 PM
Can't they lie better? February 12th, 2026.....
Anyone smart would read past the scare highlight.
And they would find out .....
1/2
Anyone smart would read past the scare highlight.
And they would find out .....
1/2
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
1/3
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
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.
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
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...
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
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...
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
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