EPSTEIN - BARR VIRUS - AP FILE.jpeg
This image provided by U.S. Department of Health and Human Services shows an illustration of the outer coating of the Epstein-Barr virus, one of the world’s most common viruses. New research is showing stronger evidence that Epstein-Barr infection could set some people on the path to later developing multiple sclerosis. (U.S. Department of Health and Human Services via AP)