Bacteria Can Bypass Blood-Brain Barrier?

It’s a surprise to researchers who believed the brain-blood barrier created an impenetrable fortress. How are molecules from dirt getting into white matter—and what are they doing up there? 
Until recently, scientists would have said no way. The brain was long thought to be a kind of fortress, separated from the body by a virtually impenetrable barrier of specialized cells. Now, that view is beginning to shift, with increasing evidence that aliens can, and do, sneak in.
 
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Scientists Find Bacteria Where It Isn’t Supposed to Be: The Brain

Source: The Daily Beast

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