Ceftriaxone does not reach the brain when it is not inflamed
http://als-cure.com/antibiotics-als/cef ... the-brain/
Doxycycline does not penetrate the blood brain barrier when there is no inflammation
http://lymemd.blogspot.nl/2013/03/blood ... rrier.html
In typical meningitis with active inflammation, there is a breakdown of the BBB and most antibiotics penetrate.