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There's a very good chance MS has an infectious comonent. Some interesting facts about MS.
It had never occured in the Faroe islands until after the second world war. What changed? Troops from the mainland were stationed there for the first time, thus acting as a vector.
Where you live matters, not your decent. Live away from the equator and your risk goes up very significantly. But its not ethnic. Move to Hawaii as a caucasian and your risk goes down, but if you are japanese and move there, your risk goes UP. The risk difference between a high risk location and a low risk one is a factor of ten - a whole order of magnitude.
Separated identical twins don't suffer at anywhere near the same rates. If it is wholely genetic this is a little odd.
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