Animal exposure over the life-course and risk of multiple sclerosis: A case-control study within two cohorts of US women

Background Whether animal exposure and specifically the timing of such exposure alters multiple sclerosis (MS) risk is unclear. We examined whether animal exposure was associated with MS risk, and whether risk differed by the participants' age. Methods We conducted a case-control study within the Nurses’ Health Study ((NHS)/NHSII cohorts). Overall, 151 women with MS and 235 controls, matched by age and study cohort, completed an animal exposure...