Nikhil Prasad Fact checked by:Thailand Medical News Team Jun 30, 2026 1 hour, 2 minutes ago
Medical News: A largely unknown virus that quietly infects millions worldwide is now raising serious concerns among scientists. Known as the JC polyomavirus, it usually causes no symptoms and goes unnoticed for years. However, new findings show that under certain conditions, this common virus can trigger severe and often fatal brain diseases.
A common lifelong virus may spread in multiple ways and can become deadly when the immune system weakens
Researchers are increasingly alarmed not only by its dangers, but also by the growing evidence that it may spread through multiple everyday routes.
What Is JC Polyomavirus?
JC polyomavirus is a tiny virus made up of DNA and protected by a tough outer shell. It belongs to a group of viruses that are known for infecting humans early in life and then staying in the body permanently.
According to researchers from the University of Coimbra, Portugal, including teams from the Faculty of Pharmacy, the Centre for Functional Ecology (CFE), Associate Laboratory TERRA, and the Laboratory of Clinical Analysis, this virus is extremely widespread.
Most people are exposed during childhood, often without any symptoms. After entering the body, the virus settles in organs such as the kidneys, bone marrow, and possibly lymph tissues, where it remains inactive for life.
In this dormant state, it does not cause harm. However, the virus is never completely eliminated, which means it can reactivate later if the immune system becomes weakened.
A Silent Infection That Can Turn Deadly
While the virus is harmless in most individuals, it can become dangerous when the body’s immune defenses are compromised.
In such cases, the virus may reactivate and spread to the brain, leading to a rare but devastating condition known as progressive multifocal leukoencephalopathy (PML). This disease attacks the brain’s white matter, which is essential for transmitting signals between nerve cells.
Symptoms can include confusion, memory loss, speech problems, vision impairment, and difficulty with movement and coordination. The condition often progresses rapidly and can be fatal.
People at highest risk include those living with HIV, cancer patients, and individuals receiving immunosuppressive therapies such as certain treatments for multiple sclerosis.
Unclear but Concerning Routes of Transmission
One of the most troubling aspects of the JC virus is that scientists still do not fully understand how it spreads. Evidence suggests that several different routes may be involved.
-Respiratory Exposure in Childhood
Some studies have found the virus in respiratory samples, especially in young children. This suggests that infection may occur through inhalation, making early childhood a critical period for transmission.
-Environmental Contamination and Food Sources
The virus is commonly detected in urine and has
been widely found in sewage and wastewater systems around the world. Alarmingly, it can persist even after water treatment.
This creates the possibility that contaminated water may spread the virus to crops and marine life. Shellfish such as oysters and mussels, as well as fresh produce, may act as carriers if exposed to polluted water.
-Possible Sexual Transmission
Researchers have also detected the virus in semen and vaginal secretions. Although this route has not been fully confirmed, it suggests that sexual contact could contribute to transmission.
-Potential Mother-to-Child Spread
There is limited and conflicting evidence about whether the virus can be passed from mother to child. Some studies suggest this may occur, but further research is needed to confirm it.
This
Medical News report highlights a growing risk. The JC virus presents a unique challenge because it spreads silently and remains hidden in the body for years. At the same time, it has the potential to cause life-threatening disease when conditions allow.
Its presence in environmental sources such as water systems and food chains adds to the concern, suggesting that exposure may be more common than previously believed.
No Cure or Vaccine Yet
Despite its widespread presence and serious risks, there is currently no approved treatment or vaccine for JC virus infection.
Medical care focuses mainly on strengthening the immune system. In some cases, stopping immunosuppressive drugs or treating underlying conditions can help control the disease.
Experimental treatments, including antiviral drugs and immune-based therapies, have been explored, but results have been inconsistent or limited by side effects.
Key Findings Raise Public Health Concerns
The study highlights several important points. First, the JC virus is extremely common, meaning most people are exposed at some point in their lives. Second, its ability to persist in the body and survive in environmental conditions makes it difficult to eliminate.
The detection of the virus in wastewater, food sources, and bodily fluids suggests that transmission may occur through multiple overlapping pathways. This makes prevention particularly challenging.
For individuals with weakened immune systems, the risk is especially serious, as reactivation of the virus can lead to severe neurological disease.
Conclusion
The JC polyomavirus is a widespread but often overlooked virus that poses a hidden threat to human health. While it remains harmless in most people, its ability to reactivate and cause fatal brain disease in vulnerable individuals makes it a significant concern. The uncertainty surrounding how it spreads—whether through air, contaminated food and water, or other routes—complicates efforts to control it. Increased awareness, improved environmental safety measures, and continued scientific research are essential to better understand this virus and reduce its impact. Developing effective treatments and preventive strategies will be crucial in protecting those most at risk in the future.
The study findings were published in the peer reviewed journal: Viruses
https://www.mdpi.com/1999-4915/18/7/716
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Medical News.
Read Also:
https://www.thailandmedical.news/articles/coronavirus
https://www.thailandmedical.news/articles/ebola
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