It may start with brain "damage" but it's 100% fatal. It's prions. I've thought up 1000 different scenarios of what is going on here and am still trying to figure out if the virus itself will lead to prions and the vax can actually prevent it, despite the other associated vax risks, or if the vax itself is what will cause prions. Thought long and hard about this. The first scenario actually seems more likely to me and would even explain why Trump is so insistent that the vax is okay to take.