The possibility of a microbiome in the human brain, once considered controversial, is gaining traction thanks to recent discoveries in vertebrates like fish. Researchers at the University of New Mexico found thriving communities of bacteria in salmon and trout brains, challenging the belief that the blood-brain barrier keeps the brain free from outside invaders. This study has led to speculation on the potential role of microbes in neurobiology, a concept that could revolutionize our understanding of brain function. Despite the skepticism surrounding this idea, the research provides strong evidence that a brain microbiome exists, hinting at a new level of neurological regulation.
https://www.quantamagazine.org/fish-have-a-brain-microbiome-could-humans-have-one-too-20241202/