A new study has revealed how a Ugandan cave known for hosting Egyptian fruit bats—natural carriers of the deadly Marburg virus—also attracts a wide range of wildlife and human visitors, creating a rare but concerning environment where disease spillover could occur. The cave, located in Queen Elizabeth National Park, has become a focal point for researchers studying how viruses may move from animals to humans in real-world conditions.
Marburg virus is a highly dangerous relative of Ebola that can cause severe haemorrhagic fever in humans, with symptoms including high fever, vomiting, muscle pain, and internal bleeding. While bats carry the virus without becoming ill, humans can become infected through contact with bat secretions, droppings, or contaminated environments, with further human-to-human transmission occurring through bodily fluids or infected surfaces.
The research focused on Python Cave, where camera traps recorded an unusually high level of interaction between bats, predators, scavengers, and people. Over 368 nights, scientists documented more than 300 wildlife encounters involving at least 14 species, including leopards, monitor lizards, vultures, and pythons, all feeding on or interacting closely with bat colonies. These repeated interactions suggest the cave functions as a high-contact ecological hotspot rather than an isolated natural habitat.
Researchers also observed that structural changes in the cave, including collapsed sections of the roof, have reduced the distance between bats and ground-level predators and humans. This has effectively created “predation funnels,” increasing opportunities for animals to come into close contact with infected bats and their waste. In some cases, species that typically avoid each other were found sharing the same space due to the abundance of food.
Alarmingly, the study also recorded 214 human visitors—including tourists, school groups, and researchers—approaching the cave mouth, often ignoring safety rules and coming within close range of the bat colony. Only one individual was seen wearing protective equipment. Scientists warn that this represents a significant exposure pathway at a known viral reservoir site, even if no transmission was observed during the study period.
Historically, Python Cave has already been linked to human cases of Marburg virus, reinforcing concerns about its spillover potential. Researchers argue that the site demonstrates how wildlife, humans, and pathogens can intersect in predictable, observable ways, challenging the assumption that such transmission events are rare or hidden.
In response, scientists are calling for stronger protective measures, including stricter visitor controls, mandatory safety gear, trained guides, and regular testing of wildlife and humans frequently exposed to the site. They also emphasize the importance of ecological monitoring and ground-level surveillance to better understand and prevent zoonotic disease spillover in high-risk environments.
