Researchers have made a surprising link between a brain disease and a bacteria in the gut. Scientists believe the microbiome, or the body's vast community of bacteria play a role in the development of a vast variety of diseases. New research suggests that bacteria found in the gut can initiate diseases in the most unrelated organs, with no obvious link to the gut and in the most unexpected ways. One particular linkage came to finding when scientists studied hereditary cerebral cavernous malformations or blood-filled bubbles that protrude from veins in brain. Scientists found that the malformations in the blood vessels of the brain were caused or initiated by bacteria growing in the gut, and it was this finding that has stimulated a lot of research in the bacteria of the gut and different body diseases.