The way the autoimmune antibodies or the streptococci themselves go through the blood-brain barrier does not need to be through special "molecular keys" as said

The way the autoimmune antibodies or the streptococci themselves go through the blood-brain barrier does not need to be through special "molecular keys" as said in the article. I wonder how much of this idea has been already investigated, but it may be that the concussion provided a breach in the form of a very small hemorragia in the brain.