The Kitum cave in Mount Elgon National Park, Kenya, is known as the world's deadliest cave. It's got some really dangerous viruses inside, like Ebola and Marburg. Experts are now worried that the Marburg virus might cause the next big outbreak, and the World Health Organization (WHO) issued a warning about it.
Marburg is an illness marked by bleeding and disruption of bodily functions. It can be deadly, with up to 88 per cent of people dying from it.