--from Cornell Weill: Drs. Sander, Brannigan, and Chin (my guy). Cornell-Weill is probably the leading facility for research into autoimmune neuropathy causes, and a post-vaccination syndrome would fall into that category, likely through molecular-mimicry mechanisms in certain people with nerve sturcture similar to the molecular structure of the pathogen in the vaccination.

Unfortunately, vaccination has been implicated in some autoimmune reactions in some people, and not just with neuropathic aftereffects. While I'd still say for most people vaccination's benefits far outweight the risks, there is a subset of pople who should be cautious. The problem is we don't yet know what/which subset. Perhaps with the sequencing of the human genome, we'll one day be able to better identify those groups.