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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Scientists Discover Ebola Can Hide in the Human Brain for Years After Recovery

For many people, surviving Ebola virus disease feels like the end of a terrifying battle. Ebola is one of the world's deadliest viruses, causing severe illness and claiming thousands of lives during outbreaks. But new research suggests that even after recovery, the virus may not be completely gone.

Scientists have discovered that Ebola can hide deep inside the human body for months or even years, especially in the brain and other areas where the immune system has limited access. A new study published in Nature Microbiology sheds light on how the virus manages to survive for so long and why this hidden presence can sometimes lead to dangerous relapses or even spark new outbreaks.

The research was conducted by scientists from the Bernhard Nocht Institute for Tropical Medicine (BNITM), the Icahn School of Medicine at Mount Sinai, and several international collaborators. Their findings provide some of the clearest evidence yet of how Ebola persists in the human nervous system.

The Hidden Threat After Recovery

Ebola virus belongs to a family of viruses known as filoviruses. It causes Ebola virus disease, a severe infection that can lead to high fever, internal bleeding, organ failure, and death.

Although many patients who survive the acute phase of the disease eventually recover, scientists have known for years that the virus can remain inside the body long after symptoms disappear. Infectious Ebola virus has been detected in semen months and sometimes even more than a year after infection.

Researchers have also found evidence that the virus can survive in so-called "immune-privileged" areas of the body. These are regions where the immune system operates more cautiously to avoid damaging delicate tissues. The brain and central nervous system are among the most important immune-privileged sites.

Because the immune response is weaker in these areas, viruses can sometimes escape complete elimination. This creates a risk that the infection may reactivate later, causing inflammation, neurological problems, or even a return of Ebola disease.

Building Miniature Human Brains in the Lab

Studying Ebola inside the human brain is extremely difficult. Scientists cannot easily observe how the virus behaves in living human brain tissue.

To solve this problem, researchers turned to an advanced laboratory model called cerebral organoids. These tiny, brain-like structures are grown from human-induced pluripotent stem cells, which are cells capable of developing into many different types of human tissue.

By carefully guiding their growth, scientists created three-dimensional structures containing several important cell types found in the human central nervous system.

These miniature brain models allowed researchers to observe how Ebola behaves over long periods of time in a human-like environment without studying actual human brain tissue.

According to the research team, cerebral organoids offer a powerful new tool for understanding how viruses persist in the nervous system and how long-term infections affect survivors.

Ebola Remains Active for Months

One of the most important discoveries was that Ebola virus remained active inside the cerebral organoids for up to 120 days.

The researchers also tested several related filoviruses, including Sudan virus, Reston virus, and Marburg virus. All of them showed the ability to replicate within the organoids for extended periods.

Importantly, the virus did not simply remain dormant. Instead, it continued producing new infectious particles throughout the experiment.

Scientists found that Ebola infected multiple types of brain cells, including neurons, which transmit signals throughout the nervous system, and astrocytes, which help support and protect neurons.

The virus also attracted microglia, the brain's specialized immune cells. Surprisingly, these immune cells themselves became infected.

This widespread infection suggests that Ebola can establish a long-lasting presence across several different cell populations within the brain.

Two Different Ways the Virus Spreads

The study revealed that Ebola uses two separate methods to spread within brain tissue.

The first is the traditional method, where newly formed virus particles bud from an infected cell and move on to infect other cells.

The second method is direct cell-to-cell transmission. In this process, the virus passes directly from one infected cell to a neighboring cell without needing to travel through the surrounding environment.

This dual strategy may help the virus survive in areas where immune defenses are limited.

Because the virus continued spreading and producing infectious particles, researchers described the infection as a form of "productive persistence." In other words, the virus remains alive and active rather than entering a completely inactive state.

Why the Immune System Cannot Eliminate Ebola

Even though the cerebral organoids mounted an immune response, it was not strong enough to eliminate the virus.

Researchers observed increased production of pro-inflammatory cytokines, molecules that help coordinate immune responses. These signals showed that the infected tissue recognized the viral threat and attempted to fight it.

However, despite this inflammatory response, Ebola continued to survive.

The findings suggest that persistent infection in immune-privileged tissues may create chronic local inflammation. This could explain why some Ebola survivors develop serious complications months after recovery.

Doctors have previously reported cases of survivors experiencing inflammation of the eyes, meninges, and brain long after the initial infection had ended.

The new study provides biological evidence supporting these observations and helps explain how such complications may develop.

How Ebola Evolves to Stay Hidden

Perhaps the most fascinating discovery involved changes in the virus itself.

The researchers found evidence that Ebola accumulates genetic mutations during long-term infections. Unlike human cells, the virus lacks sophisticated proofreading mechanisms when copying its genetic material. As a result, errors gradually build up over time.

The team identified defective viral genomes and defective virus particles in the persistently infected organoids.

These altered viral forms are known from other infections and may help viruses survive for long periods by reducing their own replication rates. By becoming less aggressive, the virus may avoid triggering stronger immune responses that could eliminate it completely.

Some of the mutations observed in the study had previously been linked to reduced viral replication in real Ebola infections.

Interestingly, the researchers also discovered several mutations that have never before been documented in Ebola survivors. Further studies will be needed to determine whether these newly identified mutations directly contribute to long-term viral persistence.

A Major Step Toward Better Treatments

The findings highlight the value of cerebral organoids as a powerful new model for studying Ebola and related viruses.

Because the organoids closely mimic human brain tissue, they may help researchers test antiviral drugs more effectively and develop treatments specifically designed to eliminate persistent infections.

The model could also reduce reliance on animal experiments while providing more accurate insights into how these viruses behave in humans.

Scientists plan to expand their work to study other lesser-known filoviruses, including Reston, Taï Forest, Bombali, and Bundibugyo viruses.

Ultimately, understanding how Ebola survives in the brain may help researchers prevent relapses, reduce long-term complications, and stop hidden infections from triggering future outbreaks.

The study serves as an important reminder that recovering from Ebola may not always mean the virus is completely gone. Instead, the battle between the virus and the human body can continue quietly for months or even years—hidden deep within the brain.

Reference: Widerspick, L., Vidal Freire, S., Steffen, J.F. et al. Host–virus determinants of Ebola virus persistence in a human cerebral organoid model. Nat Microbiol (2026). https://doi.org/10.1038/s41564-026-02388-2

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