You have probably seen headlines about rare, deadly viruses and assumed they were a lab problem. Most of the time, they are not. The real risk often starts in a quiet corner of a national park almost no one has heard of.
In western Uganda, scientists hid six solar-powered cameras at the mouth of Python Cave, a known reservoir for Marburg virus. Over four months, 214 people walked inside. Only one of them was wearing a mask.
The findings were published in April 2026 in Current Biology by Bosco Atukwatse of the Volcanoes Safaris Partnership Trust and colleagues. The cameras ran from February to June 2025 and recorded nearly 9,000 hours of activity at the cave entrance.
Visitors included tourists on wildlife trips and local school groups. Many ignored the park's safety rules. Part of the cave roof has collapsed, so the bats often cling to low walls or sit on the ground, within easy reach of anyone who steps inside.
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Why this particular cave is so dangerous
Python Cave is home to a large colony of Egyptian fruit bats, scientifically known as Rousettus aegyptiacus. According to the World Health Organization, this bat is the natural host of Marburg virus. The animals carry it without appearing sick.
Marburg is a close relative of Ebola. The WHO says it kills about half of the people it infects on average, with case fatality rates in past outbreaks ranging from 24 percent to 88 percent. There is still no approved vaccine or antiviral treatment.
Human infection usually begins the same way. People spend time inside a cave or mine where these bats roost. From there, the virus can spread between people through blood, saliva or other bodily fluids.
Two tourists who visited Python Cave in 2007 and 2008 caught the virus. One of them died.
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What the cameras also caught
The study was not just about people. The cameras logged 321 encounters involving 14 animal species inside the cave. Leopards and spotted hyenas were seen hunting bats on the cave floor. Monkeys picked up fallen bats and scavenged them.
That matters because the virus has more than one route out of the cave. A predator that catches an infected bat could in theory carry the virus toward nearby villages.
The authors described the footage as a watershed moment for field-based tracking of how a bat-borne virus moves toward humans.
The 2026 Uganda case
The study arrived just weeks before Uganda's health ministry notified the WHO of a confirmed Marburg case in Kyegegwa district, in the west of the country. CIDRAP reported that the patient was a child of about 18 months who died of the virus.
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No contacts developed symptoms and no further cases were identified.
Health officials did not link that case to Python Cave. But the Current Biology study makes it easy to see how a single visit to the wrong cave, by a child, a tourist or a park ranger, can connect a wild bat colony to a hospital bed.
What this means for travelers
If you are planning a trip to sub-Saharan Africa and considering cave tours or wildlife caving, this is the practical takeaway. The WHO advises anyone entering caves where fruit bat colonies live to wear gloves, long clothing and a well-fitting mask.
Avoid handling bats, dead or alive, and do not eat meat from animals that may have scavenged in such caves.
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The study's authors have called on Uganda's wildlife authority to require masks and protective clothing for every Python Cave visitor and to begin screening park rangers for exposure.
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This article is made and published by Aksel Kryhlmand, who may have used AI in the preparation.