In an observational, cross-sectional study, researchers assessed the prevalence of sexual dysfunction, depression, and negative health perception, and their relationships with
the Expanded Disability Status Scale (EDSS) in patients with multiple sclerosis.

In a population-based cohort study, researchers estimated the long-term risk of developing multiple sclerosis, and separately, demyelinating diseases, in patients diagnosed with and without Epstein-Barr virus-positive infectious mononucleosis.