The BCG (Bacillus Calmette-Guérin) vaccine is routinely given in the UK to school-age children. I have a friend who changed schools there often and received this vaccine four times. She now HAS MS (and has had bladder cancer, which I think is related to increased insulin as a result of the vaccine).
I do not think it will help with MS!
My hypothesis: excess insulin (hyperinsulinemia) plays a major role in MS, as developed in my initial post: http://www.thisisms.com/forum/general-discussion-f1/topic1878.html "Insulin – Could This Be the Key?"