Random: Can occur in families. Nothing known to prevent it.
Answered 7/5/2012
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Random in most: About 80-90% of MS cases occur sporadically, and though may seem to run in families, statistical risk of 30% in identical twins only. Cannot really suggest protective interventions other than to point out lower risk if no smoking, and adequate Vitamin D levels on board.
Answered 9/7/2014
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