A team of researchers have identified the first known microbe species from the modern human genome.
They believe the bacteria are not new, but were only discovered by a group of archaeologists in the 1920s.
The bacteria were initially thought to have been present in the bones of the ancestors of modern humans.
The study was published today in Science Advances.
They say they are the first new microorganisms to be found in human genomes.
Microbes are the living cells in our bodies that we eat, drink and breathe.
They can produce sugars and other chemicals that are then broken down into energy for our bodies. _____