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Could there be bacteria or any microorganisms in the brain?? If yes, please state some examples??

My teacher gave us a project to create a microorganism (such as bacteria) that is beneficial to humans. Please help me with an idea???? viewtopic.php?f=24&t=19991




Moderator note: I've combined your questions into one post since these are similar. This way, the same expert can help you with both of your questions at the same time. Thank you.

Great Question! I did a little research (https://www.livescience.com/64098-bacte ... biome.html) off of this article and although the findings are not confirmed, it states that harmless bacteria may be living in our brains. I hope this helps!