Though in early stages of research, Weill Cornell Medical College has connected “MS-like” brain damage in rats to a rare strain of Clostridium perfringens or a bacteria causing food poisoning. The toxin epsilon can cross the blood-brain barrier causing damage to the brain similar to that found in multiple sclerosis patients. Though caution is strongly suggested in making the connection without further research, if the connection can be confirmed a possible vaccination could prevent multiple sclerosis from this environmental source.

Read for a based review on the topic: http://www.bbc.co.uk/news/health-25925658.
Read for an in-depth report:  http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0076359.

Image from, www.foodsafety.asn.au.