Study Reveals That an Impaired Innate Immune System is Likely Behind Long COVID Manifestations
Nikhil Prasad Fact checked by:Thailand Medical News Team Mar 20, 2026 1 hour, 44 minutes ago
Medical News: Understanding Why Symptoms Linger After COVID-19
A new scientific review is shedding light on one of the biggest medical mysteries of the pandemic—why millions of people continue to suffer from Long COVID long after the initial infection has passed. Researchers now believe that the root cause may not be the virus itself lingering in the body, but rather a failure of the body’s innate immune system to properly switch off after fighting the infection.
Scientists uncover how a malfunctioning immune system may be driving persistent Long COVID symptoms
The study was conducted by scientists from the Department of Microbiology and Molecular Genetics, University of the Punjab, Lahore, Pakistan; the School of Veterinary Medicine and Biomedical Sciences, University of Nebraska–Lincoln, USA; and the Department of Biology, University of Ottawa, Canada.
The Immune System That Won’t Turn Off
Normally, when the body fights an infection, the immune system activates inflammation to kill the virus and then shuts down once the threat is gone. However, in Long COVID patients, this shutdown process appears to be broken.
Instead of calming down, the immune system continues to stay active. This creates a cycle of ongoing inflammation that can damage tissues and lead to symptoms such as fatigue, brain fog, breathlessness, and heart issues.
Researchers describe this as a failure of “immune resolution”—a process that is supposed to restore the body back to normal after illness. In Long COVID, this reset mechanism simply does not work properly.
Hidden Triggers Keep the Fire Burning
One key discovery is that leftover fragments of the virus may remain in the body, especially in areas like the gut, lungs, or nasal passages. These remnants do not cause infection but continue to irritate the immune system.
At the same time, other hidden triggers may worsen the problem. These include reactivation of dormant viruses like Epstein-Barr virus, and leakage of bacterial toxins from the gut due to a weakened intestinal barrier.
Together, these factors continuously stimulate immune sensors, keeping the body in a constant state of alert.
Damage Signals Add Fuel to the Problem
The study also found that damaged cells release alarm signals that further activate the immune system. These signals, known as danger molecules, create a feedback loop where inflammation leads to more damage, and more damage leads to even more inflammation.
This ongoing cycle explains why symptoms can persist for months or even years in some individuals.
The Body’s Repair System Is Also Failing
Another critical issue is that the body’s natural repair system is not functioning properly. Normally, special molecules help stop inflammation and promote healing. However, in Long COVID patients, these molecules are either reduced or ineffective.
In addition,
immune cells that are supposed to clean up dead cells are not working as they should. This leads to a buildup of cellular debris, which further worsens inflammation.
This
Medical News report highlights that the immune system is essentially stuck in “fight mode,” unable to transition into recovery.
Long-Term Changes in the Immune System
Perhaps most concerning is that the infection may permanently alter immune cells. The study found that immune cells can undergo long-lasting changes in how they behave, making them either overly aggressive or unusually weak.
These changes can persist long after the virus is gone, helping explain why Long COVID is so difficult to treat.
Conclusion
The findings strongly suggest that Long COVID is not simply a lingering infection but a complex immune disorder where the body fails to properly shut down inflammation and repair itself. This ongoing immune dysfunction, driven by persistent triggers and faulty recovery mechanisms, creates a self-sustaining cycle of symptoms. Understanding this process opens the door for new treatments aimed at restoring immune balance rather than just targeting the virus itself.
The study findings were published in the peer reviewed journal: Clinical Immunology.
https://www.sciencedirect.com/science/article/pii/S1521661626000392
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