Cytomegalovirus seropositivity is negatively associated with multiple sclerosis. Sundqvist E, Bergström T, Daialhosein H, Nyström M, Sundström P, Hillert J, Alfredsson L, Kockum I, Olsson T Mult Scler. 2013 Sep 2. PMID: 23999606. Abstract CommentRecommendBookmarkWatch