nanolipids contained in the Pfizer and Moderna 'vaccines' can cross the BBB (blood-brain barrier) with ease due to BBB being lipid soluble
This was grabbed from an article I was reading, after doing some research on the lipid nanonparticles that are in the 'vaccines' (read: nanoweapon).
…"Low levels of mRNA could be detected in all examined tissues except the kidney [in rats]. This included heart, lung, testis, and also brain tissues, indicating that the mRNA/LNP platform crossed the blood/brain barrier, although to very low levels (2–4% of the plasma level).
Therefore, these reports suggest that the LNPs can carry bits of the mRNA vaccine into the brain.
But we still don’t know what would happen after the mRNA vaccine enters the brain (more on this below)…"
if the "vaccine" is able to enter the brain, and trigger an immune response, you can only guess what happens from there.
https://swanislandmaine.com/2021/03/22/concerns-of-lipid-nanoparticle-carrying-mrna-vaccine-into-the-brain-what-to-make-of-it/