
Two researchers carefully descend into Grootboom cave, located just miles away from the densely populated city of Johannesburg in South Africa.

The researchers from the University of Pretoria and the Centers for Disease Control and Prevention (CDC) are tracking animals all around the world to create an early-warning system for diseases that could affect humans. Here, they hunt for bats inside Grootboom cave.

The cave is inhabited by thousands of bats, any of which could be carrying deadly diseases such as Ebola, Marburg or rabies.


There are 1,240 species of bats worldwide, which may explain why many viruses can be found inside them.




