Hi Keith,
I preferred the Godfather to Daffy Duck,!!!
Meningitis is the inflammation of the lining around the brain and spinal cord.

Septicaemia is the blood poisoning form of the disease.
It is caused by as bacteria or a virus.

http://cat.inist.fr/?aModele=afficheN&cpsidt=13462338
"Bacterial penetration across the blood-brain barrier (BBB) into the central nervous system is the first step in development of meningitis."
It seems that other factors come into play in Meningitis
which close the pores of the BBB after bacterial infection.
"Anti-TNF-a antibody blocked both the BBB opening and the entrance of circulatory S. pneumoniae type 6 into brain, indicating that TNF-a played an important role in controlling the opening of BBB."
Disruption of the BBB occurs after bacterial infection of the brain, caused meningitis, which is quite different to the long term open BBB we have, collecting toxins and damage over the years. There is a short temporary opening of the BBB in Meningitis, and as you see above, other factors come into play to close the pores. Parkies have a permanent leak, in meningitis it is a short transient disruption.
Your question was quite a good one actually, not the "Quackers" from Daffy Duck, The Godfgather or Keith Bridgeman, but I can't spend time on any more from any of them.
Hope you are selling lots of your brew to Parkies, how are sales going?
Ron