Finally some good news
This study is actually from Basque Country
From our data, the absence of immune antigens (A, B or Rhesus +) defined by the group O- seems to be protective in the MS group with an odds ratio of 0.49 (95% confidence interval 0.309–0.796), while the presence of Rh+ plus A or B seems to be a risk in developing multiple sclerosis.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6859684/