Are the surgical site infections "in the brain" caused by same bacteria found in "other parts of the body"?

  1. There's a blood-brain barrier so, most of the bacteria that infect lungs won't reach the brain. But when you do a surgery in the brain it gives direct access to the bacteria, let's say Pneumocystis jirovecii which infect lungs, got in through a contaminated tool to the brain. So, can it infect the brain? Or it just can't survive in the brain as it's mostly thrive in lungs?

  2. Are there any brain specific bacteria that can only infect brain but not the other parts of the body such as lungs?

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