Viral Infections May Leave Lasting Immune Damage, Mouse Study Finds
Mice kept weaker immune defences long after the virus was cleared, while vaccinated animals were spared, according to ScienceDaily.
Key points
- Mice recovered from acute viral infections but kept impaired immune function
- Changes included scar-like tissue buildup and disrupted immune cell positioning in the spleen
- Mice vaccinated before infection did not show these lasting problems
- The findings come from mouse research and do not yet confirm the same effect in humans
Researchers at Pompeu Fabra University have found that a viral infection can leave lasting harm to the immune system, even after the virus has been cleared. According to ScienceDaily, the study was carried out in mice and was published in the journal Cell Death & Disease. The team also found that vaccination appeared to prevent this damage.
The mice had fought off their infections successfully. However, their immune systems stayed weakened for a long period afterwards. As a result, they were less able to respond to new threats. The researchers noted that the animals were effectively left in a state of reduced immune strength.
How the infection affected the immune system
The scientists looked closely at the spleen, an organ that helps coordinate the body’s immune defences. During the fight against the virus, the spleen developed fibrosis, a condition in which scar-like tissue builds up. The placement and arrangement of immune cells inside the organ were also disturbed.
These changes disrupted the communication between immune cells that is needed to activate T cells. These cells are needed to spot and eliminate infected cells, so their reduced activity left the mice struggling to mount strong responses to later challenges.
Andreas Meyerhans, an ICREA research professor at the university, led the work. He said the common view of acute viral infections as minor and short-lived may overlook effects that are not visible at first and can continue after the infection has ended.
Vaccination appeared to protect the immune system
The team then asked whether these lasting effects could be prevented. Their attention turned to vaccines, which get the immune system ready to identify a microbe before illness strikes. The difference between the two groups of animals was clear.
Mice that were vaccinated before infection did not develop the spleen damage or the T-cell problems seen in unvaccinated mice. Their spleens stayed structurally normal, and the T cells functioned about as well as those in animals that had never been infected.
Paula Cebollada Rica, the first author of the study, said that the vaccinated animals avoided both the illness and the lasting weakening of their immune systems. In her view, vaccines may therefore help the immune system cope with future challenges, not only prevent disease.
Why the findings matter and their limits
The findings expand the case for vaccines. Apart from lessening the direct impact of an infection, immunisation may also stop lasting harm that undermines the body’s defences. The authors said this kind of protection may not be obvious to the public.
The scientists noted that the results come from mice and cannot confirm the same outcome in people. Still, the work prompts serious questions about how viral infections shape long-term immune health and how vaccines might support it. The team also said that scientific evidence matters most when policy decisions could weaken efforts to prevent infectious diseases.
Meyerhans added that public health officials may need to explain the wider value of vaccines more clearly. He argued that immunisation brings significant health gains while remaining fairly inexpensive for society, and he encouraged people to keep trusting vaccines as one of the most effective tools against disease.
Frequently asked questions
Did the study test the effect in humans?
No. According to ScienceDaily, the research was carried out in mice. The researchers said the findings cannot confirm the same outcome in people.
What did vaccination do in the study?
Mice vaccinated before infection did not develop spleen damage or T-cell dysfunction after recovering. Their immune systems kept working at levels similar to mice that had never been infected.
Where was the research published?
The study was published in Cell Death u0026amp; Disease. It was led by researchers from Pompeu Fabra University, according to ScienceDaily.
Sources
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