I also find interesting, and increasingly compelling, the idea that vaccines may trigger preexisting viruses in many conditions including ME, MS, Autism...
http://archives.cbc.ca/health/disease/clips/12711/
i don't really know if a tetanus shot is really the same thing but i had one when I was already ill and im sure they gave me something else at the time (I remember them giving me something out of the fridge directly on my tongue). the thing is I was already ill and had the vaccs because I was at the Docs with a friend cos I had too much time on my hands because I was ill D'oh hey but aint hindsight a wonderful things. Like messing around with photography chemicals for three years at college with MCS Double D'oh